How to fix the killstreak sword not giving boost (?)

Im making a sword where each time you get a kill, a IntValue changes by 1, which for example the IntValues value Is 3 (Which equals to 3 kills) you get a small boost, but It appears to do nothing

Script:

local Tool = script.Parent
local SoundFolder = Tool.Sounds
local SlashAttack
local DamagePerSlash = 20
local Boolens = {
	Debounce = false,
	CanDamage = false
}
local Animations = { ---Oh boi there Is alot
	EquipAnimation = Tool.EquipAnimation,
	Idle = Tool.Idle,
	Slash = Tool.Slash,
}

Tool.Equipped:Connect(function()
	SoundFolder.Unsheath:Play()
	local Humanoid = Tool.Parent.Humanoid
	
	local EquipAnimationTrack = Humanoid:FindFirstChild("Animator"):LoadAnimation(Animations.EquipAnimation)
	EquipAnimationTrack:Play()
	task.wait(0.30)
	local Idle = Humanoid:FindFirstChild("Animator"):LoadAnimation(Animations.Idle)
	Idle:Play()
	Tool.Unequipped:Connect(function()
		Idle:Stop()
	end)
end)

---Phases---
if Tool.Kills.Value == 3 then
	DamagePerSlash = 25
end
if Tool.Kills.Value == 5 then
	DamagePerSlash = 30
	Tool.Parent.Humanoid.WalkSpeed = 20
	local ThemeSong = Instance.new("Sound")
	ThemeSong.Parent = Tool.Parent.Torso
	ThemeSong.Name = "ThemeSong"
	ThemeSong.Volume = 3
	ThemeSong.Looped = true
	ThemeSong.SoundId = "rbxassetid://10033782180"
	ThemeSong:Play()
end
if Tool.Kills.Value == 15 then
	DamagePerSlash = 35
	Tool.Parent.Humanoid.WalkSpeed = 30
	local ThemeSong = Instance.new("Sound")
	ThemeSong.Parent = Tool.Parent.Torso
	ThemeSong.Name = "ThemeSong"
	if Tool.Parent.Torso:FindFirstChild("ThemeSong") then
		ThemeSong.Volume = 3
		ThemeSong.Looped = true
		ThemeSong.SoundId = "rbxassetid://10239133106"
		ThemeSong:Play()
	end
end

Tool.Activated:Connect(function()
	if not Boolens.Debounce then
		Boolens.Debounce = true
		Boolens.CanDamage = true
		SoundFolder.Slash:Play()
		print("The tool has been clicked")
		local Humanoid = Tool.Parent.Humanoid

		SlashAttack = Humanoid:FindFirstChild("Animator"):LoadAnimation(Animations.Slash)
		SlashAttack:Play()
		task.wait(0.5)
		Boolens.CanDamage = false
		wait(1)
		Boolens.Debounce = false
	end
end)

Tool.Handle.Touched:Connect(function(hit)
	local Player = game:GetService("Players"):GetPlayerFromCharacter(hit.Parent)
	if Player then
		local player1 = game.Players:GetPlayerFromCharacter(Tool.Parent)
		local player2 = game.Players:GetPlayerFromCharacter(hit.Parent)

		if (player1 ~= nil) and (player2 ~= nil) then
			local humanoid = (player2.Character or player2.CharacterAdded:Wait()):FindFirstChildWhichIsA("Humanoid")

			if (player1.TeamColor ~= player2.TeamColor) then
				if (humanoid ~= nil) and Boolens.CanDamage == true then
					Boolens.CanDamage = false
					humanoid:TakeDamage(DamagePerSlash)
					if humanoid.Health == 0 then
						SoundFolder["Kill Get"]:Play()
						Tool.Kills.Value = Tool.Kills.Value + 1
					end
				end
			end
		end
	else
		local NPCHumanoid = hit.Parent:WaitForChild("Humanoid")
		if NPCHumanoid and Boolens.CanDamage == true then
			Boolens.CanDamage = false
			NPCHumanoid:TakeDamage(DamagePerSlash)
			if NPCHumanoid.Health == 0 then
				SoundFolder["Kill Get"]:Play()
				Tool.Kills.Value = Tool.Kills.Value + 1
			end
		end
	end
end)

So i have a way but its pretty inefficient First a script will detect the player name who kill them after they die,then get all the players and find the killer: Here is the local script(in starter player's player script)

game.workspace.Players.LocalPlayer.Character.Humanoid.Died:Connect(function() Local kill = game.workspace.Players.LocalPlayer.Character.Humanoid:FindFirstChild("creator") Local killName = kill.Value.Name For i,v in pairs(game.Players:GetPlayers()) do If v.Name == killName then --fire some server with player name in it,the "Remote" down here is the remote event Game.ReplicatedStorage.Remote:FireServer(killName) end end end)

In the sword script:

Game.ReplicatedStorage.Remote.OnServerEvent:Connect(function(plr,name) if name == plr.Name then --Do the increase damage stuff here end end)

I write this on web so there might be some error like missing end or smth,but the script might work

Use GetPropertyChangedSignal:

Tool.Kills:GetPropertyChangedSignal("Value"):Connect(function()
	--Phases here
end)