why do i earn money and it shows up in the leaderboard but wont show up for another player?

So i am working a simulator game and i was working pretty well but then i hit a slump. This script works and all but when a person clicks and earn money the money wont show up for another player.

Here is the script:

local toolName = "AdvancedCard" -- what tool(name) must be held to earn?
local randomizeAmount = true -- randomize cash amount? if true, cash will be randomised, if false, cash will be the same everytime
local cashStatic = 1 --if 'randomizeAmount' is FALSE, how much money should be earned by 1 click?
local cashRandomX = 15 --if 'randomizeAmount' is TRUE, what is the MINimum cash amount?
local cashRandomY = 20 --if 'randomizeAmount' is TRUE, what is the MAXimum cash amount?
local debugging = true --debugging mode? if true, info will be print to the console, if false, script is not printing anything
local leaderstatName = "Cash" --name of Cash leaderstat

----------

local plr = game.Players.LocalPlayer
local equip = false
local mouse = plr:GetMouse()

plr.Backpack:WaitForChild(toolName).Equipped:Connect(function()
	equip = true
end)

plr.Backpack:WaitForChild(toolName).Unequipped:Connect(function()
	equip = false
end)

mouse.Button1Down:Connect(function()
	if equip then
		wait(0.5)
		if randomizeAmount then
			local amount = math.random(cashRandomX, cashRandomY)
			plr.leaderstats:WaitForChild(leaderstatName).Value = plr.leaderstats:WaitForChild(leaderstatName).Value + amount
			if debugging then
				print("Player "..plr.Name.." just earned $"..amount.." for clicking with the tool.")
			end
		else
			plr.leaderstats:WaitForChild(leaderstatName).Value = plr.leaderstats:WaitForChild(leaderstatName).Value + cashStatic
			if debugging then
				print("Player "..plr.Name.." just earned $"..cashStatic.." for clicking with the tool.")
			end
		end
	end
end)

Please help me fix this.

You can't change a value on the server from a local script on filtering enabled games because it won't replicate to other clients. Filtering will make sure this change is not replicated. You should use a remote event or a remote function to do this, preferably a remote event.

You should try something like this:

(Please note, this is very easy to exploit, apply some good security to your remotes.)

Server:

-- Script (on server)

-- Create a remote event that will be fired to update player's cash.

local RE = Instance.new("RemoteEvent", game.ReplicatedStorage))
RE.Name = "UpdateCash"

RE.OnServerEvent:Connect(function(self, value)
	self.leaderstats.Cash.Value = self.leaderstats.Cash.Value + value
end)

Client:

-- Local Script (on client)

repeat
	wait()
until game:GetService("Players").LocalPlayer

local lp = game.Players.LocalPlayer
local lpM = lp:GetMouse()

local randomizeAmount = true

lp.Backpack:WaitForChild("AdvancedCard").Equipped:Connect(function()
	local debounce = false
	lpM.MouseButton1Down:Connect(function()
		if debounce == true then
			wait(0.5)
			debounce = not debounce
		else
			if randomizeAmount == true then
				game.ReplicatedStorage.UpdateCash:FireServer(math.random(15, 20))
			else
				game.ReplicatedStorage.UpdateCash:FireServer(1)
			end
			debounce = not debounce
		end
	end)
end)

Sorry if I left behind any errors or bad coding habits, un-testing code and kind of rushing.