[SOLVED] Attack doesn't fire after another attack?

Hello. I'm making a fireball that seems to work fine, but the problem is that it won't get cast after I cast an attack and hold it to the max.

repeat wait(1) until game.Players.LocalPlayer.Character or game.Players.LocalPlayer.CharacterAdded:Wait()

local player = game.Players.LocalPlayer
local mouse = player:GetMouse()
local char = player.Character or player.CharacterAdded:Wait()

local UIS = game:GetService("UserInputService")
local debounce = false
local holding = false

local root = char:WaitForChild("HumanoidRootPart")
local hum = char:WaitForChild("Humanoid")

local sizeX, sizeY = 2.2, 2.2
local maxSizeX, maxSizeY = 5.5, 5.5

local circle = game.ReplicatedStorage.Circles:WaitForChild("Circle")

local cast = Instance.new("Animation")
cast.AnimationId = "rbxassetid://4716165640"
local castAnim = hum:LoadAnimation(cast)

game:GetService("ContentProvider"):PreloadAsync({cast})

script.Parent.Equipped:Connect(function()
	UIS.InputBegan:Connect(function(key, gpe)
		if gpe then return end
		
		if key.KeyCode == Enum.KeyCode.Q and not debounce and not holding and hum.PlatformStand ~= true then
			debounce = true
			holding = true
			
			castAnim:Play()
			
			castAnim:GetMarkerReachedSignal("Pause"):Connect(function()
				castAnim:AdjustSpeed(0)
			end)
			
			circle.Parent = game.Workspace
			circle.CFrame = root.CFrame * CFrame.new(0, 0, -3.5)
			
			spawn(function()
				while holding do
					sizeX = sizeX + 0.05
					sizeY = sizeY + 0.05
					
					print("sizex ", sizeX)
					
					circle.CFrame = root.CFrame * CFrame.new(0, 0, -3.5)
					circle.Size = Vector3.new(sizeX, sizeY, 0.1)
					

					if holding and sizeX >= maxSizeX then
						game.ReplicatedStorage.Remotes.InitializeAttack:FireServer(sizeX, sizeY)
						castAnim:Stop()
						break
					elseif not holding and sizeX >= 2.5 then
						game.ReplicatedStorage.Remotes.InitializeAttack:FireServer(sizeX, sizeY)
						castAnim:Stop()
						break
					elseif not holding and sizeX <= 2.5 then
						castAnim:Stop()
						break						
					end
					
					wait()
				end
				
				sizeX = 2.2
				sizeY = 2.2
			end)
			
			spawn(aim)
			
			spawn(function()
				wait()
				debounce = false
			end)				
		end
	end)
	
	UIS.InputEnded:Connect(function(key, gpe)
		if gpe then return end
		
		if key.KeyCode == Enum.KeyCode.Q and holding and not debounce and sizeX > 2.5 then
			debounce = true
			holding = false
			
			castAnim:Stop()
			game.ReplicatedStorage.Remotes.InitializeAttack:FireServer(sizeX, sizeY)
			
			spawn(function()
				wait(1)
				debounce = false
			end)
		end
	end)
end)

local bodyPosition = Instance.new("BodyPosition")
bodyPosition.MaxForce = Vector3.new(100000, 100000, 100000)
bodyPosition.P = 100000
bodyPosition.D = 500
bodyPosition.Parent = char

local bodyGyro = Instance.new("BodyGyro")
bodyGyro.MaxTorque = Vector3.new(400000, 400000, 400000)
bodyGyro.P = 400000
bodyGyro.D = 500
bodyGyro.Parent = char

function aim()
	bodyPosition.Parent = root
	bodyPosition.Position = root.Position
	bodyGyro.Parent = root
	hum.PlatformStand = true
	
	while true do
		if holding then
			bodyGyro.CFrame = CFrame.new(root.Position, mouse.Hit.p)
		end
		
		if circle.Parent == game.ReplicatedStorage:WaitForChild("Circles") then
			break
		elseif not holding and sizeX < 2.5 then
			circle.Parent = game.ReplicatedStorage.Circles
			break
		end
		
		game:GetService("RunService").Heartbeat:Wait()
	end
	
	wait(0.5)
	root.CFrame = CFrame.new(root.Position) * CFrame.Angles(0, math.rad(root.Orientation.Y), 0)
	bodyPosition.Parent = char
	bodyGyro.Parent = char
	hum.PlatformStand = false
end

local projectiles = game.ServerStorage:WaitForChild("Projectiles")
local circle = game.ReplicatedStorage:WaitForChild("Circles").Circle

local debounce = false
local cooldown = false

game.ReplicatedStorage.Remotes.InitializeAttack.OnServerEvent:Connect(function(player, sizeX, sizeY)
	if not cooldown then
		cooldown = true
		
		local char = player.Character or player.CharacterAdded:Wait()
		local hum = char:WaitForChild("Humanoid")
		local root = char:WaitForChild("HumanoidRootPart")
		local database = player:WaitForChild("Database")
		local damage = math.floor(database.HP.Value / 3)
		local fireball = projectiles.Fireball:Clone()
		
		circle.Parent = game.Workspace
		circle.Orientation = root.Orientation
		circle.CFrame = root.CFrame * CFrame.new(0, 0, -3.5)
		circle.Size = Vector3.new(sizeX, sizeY, 0.1)
		
		fireball.Parent = game.Workspace
		fireball.CFrame = circle.CFrame * CFrame.new(0, 0, -2)
		
		local bodyVelocity = Instance.new("BodyVelocity")
		bodyVelocity.MaxForce = Vector3.new(math.huge, math.huge, math.huge)
		bodyVelocity.Velocity = circle.CFrame.lookVector * 60
		bodyVelocity.Parent = fireball
		
		database.Level.XP.Value = database.Level.XP.Value + 15
		database.MagicLevel.MagicXP.Value = database.MagicLevel.MagicXP.Value + 15
		
		for i = sizeX, 2.2, -0.2 do
			circle.Size = Vector3.new(i, i, 0.1)
			game:GetService("RunService").Heartbeat:Wait()
		end
		
		sizeX = 2.2
		sizeY = 2.2
		print("SizeX ", sizeX)
		circle.Size = Vector3.new(sizeX, sizeY, 0.1)
		circle.Parent = game.ReplicatedStorage.Circles
		
		fireball.Touched:Connect(function(hit)
			if hit.Name ~= "Dawn's Birth" then	
				local explosion = game.ServerStorage:WaitForChild("Misc").Explosion:Clone()			
				explosion.CFrame = fireball.CFrame
				explosion.Parent = game.Workspace
				
				fireball:Destroy()
				
				if hit.Parent:FindFirstChild("Humanoid") then
					hit.Parent:FindFirstChild("Humanoid"):TakeDamage(damage)
				end
				
				spawn(function()
					for i = 180, 0, -2 do
						explosion.Orientation = Vector3.new(0, i, 0)
						game:GetService("RunService").Heartbeat:Wait()
					end					
				end)
				
				spawn(function()
					for i = 0.4, 1, 0.01 do
						explosion.Transparency = i
						game:GetService("RunService").Heartbeat:Wait()
					end
					
					explosion.Transparency = 1
				end)
				
				for i = 2, 9, 0.1 do
					explosion.BlastMesh.Scale = Vector3.new(i, 2, i)
					game:GetService("RunService").Heartbeat:Wait() 
				end
				
				explosion:Destroy()
			end
		end)
		
		local co = coroutine.create(function()
			pcall(function()
				wait(5)
				fireball:Destroy()
			end)
		end)
		
		coroutine.resume(co)
		
		wait(1)
		cooldown = false			
	end
end)

As long as I don't hold the button until the attack gets released, I can fire as many attacks afterward, but I can't fire any more attacks if I hold one attack to the max.