How would I remove the camera restrictions in the Y axis?

Put this code in LocalScript in StarterCharacterScripts

local ContextActionService = game:GetService("ContextActionService")
local UserInputService = game:GetService("UserInputService")
local RunService = game:GetService("RunService")

local Camera = {}

function Camera.new()
	local self = setmetatable(
		{},
		{
			__index = function(self, Index)
				if Camera[Index] then
					return Camera[Index]
				end
			end
		}
	)
	
	self.CurrentCamera = game.Workspace.CurrentCamera
	self.Character = game.Players.LocalPlayer.Character or game.Players.LocalPlayer.CharacterAdded:Wait()
	
	self.X = 0
	self.Y = 0
	
	self.Sensitivity = 0.015
	self.CameraOffset = Vector3.new(0, 3, 12)
	
	self.IsRightMouseButtonDown = false
	
	self:Initialize()
	
	return self
end

function Camera:Initialize()
	self.CurrentCamera.CameraType = Enum.CameraType.Scriptable

	ContextActionService:BindAction(
		"RightClickChanged", 
		
		function(ActionName, InputState, InputObject)
			self:RightClickChanged(ActionName, InputState, InputObject) 
		end, 
		
		false, 
		Enum.UserInputType.MouseButton2
	)
	
	ContextActionService:BindAction(
		"UpdateAngles",
		 
		function(ActionName, InputState, InputObject)
			self:UpdateAngles(ActionName, InputState, InputObject) 
		end,
		 
		false,
		Enum.UserInputType.MouseMovement
	)
	
	RunService:BindToRenderStep("UpdateCamera", 200, function()
		self:UpdateCamera()
	end)
end

function Camera:RightClickChanged(ActionName, InputState, InputObject)
	if InputState == Enum.UserInputState.Begin then
		IsRightMouseButtonDown = true
	elseif InputState == Enum.UserInputState.End then
		IsRightMouseButtonDown = false
	end
end

function Camera:UpdateAngles(ActionName, InputState, InputObject)
	if IsRightMouseButtonDown then
		UserInputService.MouseBehavior = Enum.MouseBehavior.LockCurrentPosition
		
		self.X = self.X + (InputObject.Delta.X * -self.Sensitivity)
		self.Y = self.Y + (InputObject.Delta.Y * -self.Sensitivity)
	else
		UserInputService.MouseBehavior = Enum.MouseBehavior.Default
	end
end

function Camera:UpdateCamera()
	self.CurrentCamera.CFrame = CFrame.new(self.Character.HumanoidRootPart.Position) * CFrame.fromEulerAnglesXYZ(0, self.X, 0) * CFrame.fromEulerAnglesXYZ(self.Y, 0, 0) * CFrame.new(self.CameraOffset.X, self.CameraOffset.Y, self.CameraOffset.Z)
				
	local CameraRay = Ray.new(self.Character.HumanoidRootPart.Position, self.CurrentCamera.CFrame.Position - self.Character.HumanoidRootPart.Position)
	local Ignore = {self.Character}
	
	local HitPart, HitPosition = game.Workspace:FindPartOnRayWithIgnoreList(CameraRay, Ignore)
	
	self.CurrentCamera.CFrame = (self.CurrentCamera.CFrame - (self.CurrentCamera.CFrame.Position - HitPosition)) + (self.Character.HumanoidRootPart.Position - self.CurrentCamera.CFrame.Position).Unit
	self.CurrentCamera.Focus = self.CurrentCamera.CFrame
end

return Camera.new()