How do I manipulate a gui to only show up for a certain player?

Game has filtering enabled turned on, and the local script is located in: game.StarterGui.ScreenGui.Frame.ImageButton.Shopscript

local GUI = script.Parent.Parent.Parent
local imagebutton = script.Parent
local Replistore = game:GetService("ReplicatedStorage")
local Frame = script.Parent.Parent
local MoveGui = Frame:WaitForChild("CloseGui") 
local Shopbulletin = Frame.TextLabel
local SHOPbutton = game.Workspace.SHOPbutton
local Buttondebounce = true
local openagain = true

function checkplayer(otherpart)
	local humanoid = otherpart.Parent:FindFirstChild("Humanoid")
	if humanoid ~= nil then
		plr = game.Players:GetPlayerFromCharacter(otherpart.Parent)
		points = plr.leaderstats.Points
	end
end

function checkpurchase()
	local checksword = plr.Backpack:FindFirstChild("ClassicSword")
	if points.Value >= 40 and checksword == nil then
		points.Value = points.Value - 40
		Replistore.ClassicSword:Clone().Parent = plr.Backpack
		Replistore.ClassicSword:Clone().Parent = plr.StarterGear
	elseif checksword ~= nil then
		Shopbulletin.Text = "You already have a sword!"
		wait(1.5)
		Shopbulletin.Text = "Welcome to the place shop!"
	else
		local Text = script.Parent.Parent.TextLabel
		local temppoints = 40 - points.Value
		Shopbulletin.Text = "You need to have "..temppoints.." more points!"
		wait(1.5)
		Shopbulletin.Text = "Welcome to the place shop!"
	end
end

function closegui()
	Frame:TweenPosition(UDim2.new(-1.5, 0, 0, 0)) 
	wait(1.5)
	script.Parent.Parent.Visible = false
	openagain = true
end

function opengui()
	script.Parent.Parent.Visible = true
	Frame:TweenPosition(UDim2.new(0.25, 0, 0, 0))
	openagain = false
	wait(1.5)
end

function Openshop(otherpart)
	if not Buttondebounce and not openagain then
		return
	end
	Buttondebounce = false
	checkplayer(otherpart)
	SHOPbutton.BrickColor = BrickColor.Red()
	opengui()
	wait(1)
	SHOPbutton.BrickColor = BrickColor.Gray()
	Buttondebounce = true
end

imagebutton.MouseButton1Click:connect(checkpurchase)
MoveGui.MouseButton1Click:connect(closegui)
SHOPbutton.Touched:connect(Openshop)

I've tested this in a test local server w/ two players, and when one player touched the button, the Gui showed up for both players, even for the other player who didn't touch the button. I intended for the gui to just show up for the player who pressed the button, and I'm not sure what to do from here. Thanks in advance!