Error : Mouse1Click is not a valid member of ServerScriptService
local repStorage = game:GetService("ReplicatedStorage")
local remote = repStorage:FindFirstChild("ButtonClick")
local button = script.Parent
local debounce = false
button.Mouse1Click:Connect(function()
if not debounce then
debounce = true
local playerPoint = game.Players.LocalPlayer.leaderstats.Points
remote:FireServer(playerPoint)
wait(0.01)
debounce = false
end
end)

2 comments
What do you do with the 'playerPoint' you send to the server? You should only tell the server that they clicked. Not send a current value of something to be added. You risk the client exploiting the amount here.
Also 'Mouse1Click' isn't an event for any object in Roblox. I'm assuming you mean 'MouseButton1Click' for a GuiButton: https://developer.roblox.com/api-reference/event/GuiButton/MouseButton1Click