How would I make this serverscript FE compatible? [Help?]

--//Variables
local AdminModule = require(game:GetService("ReplicatedStorage").AdminModule)
--//Main
game.Players.PlayerAdded:Connect(function(player)
	--//Variables
	local PlayerGui = player.PlayerGui
	local AdminPanel = PlayerGui:WaitForChild("AdminPanel",7)
	local Main = AdminPanel.Main
	local PlayerData = Main.PlayerData
	local MainFunctions = Main.MainFunctions
	local Playerlist = Main.Playerlist
	
	--//Admin Checking & Handling
	if AdminModule.checkAdmin(player.Name) == true then 
		
		MainFunctions.ResetData.MouseButton1Click:Connect(function()
			local PlayerSelected = AdminModule.getSelected(player)
			if PlayerSelected == nil then
				print("Player has not been selected!")
			else
				game.Players[PlayerSelected].PlayerData.Level.Value = 1
				game.Players[PlayerSelected].PlayerData.XP.Value = 0
				game.Players[PlayerSelected].PlayerData.NeededXP.Value = 1000
				game.Players[PlayerSelected].PlayerData.Money.Value = 0
				game.Players[PlayerSelected].PlayerData.Rebirth.Value = 0
				game.Players[PlayerSelected].PlayerData.XPRate.Value = 1
				wait(1)
				game.Players[PlayerSelected]:Kick("Your data has been reset for various reasons. Please rejoin!")
			end				
		end)		
		MainFunctions.AdminTool.MouseButton1Click:Connect(function()
			--don't really got an admin tool exdee
		end)
		
		MainFunctions.Shutdown.MouseButton1Click:Connect(function()
			for i,v in pairs(game.Players:GetChildren())do
				v:Kick("Server has been shutdown. Please rejoin!")
			end
		end)
		
		MainFunctions.KickPlayer.MouseButton1Click:Connect(function()
			local PlayerSelected = AdminModule.getSelected(player)
			if PlayerSelected == nil then 
				print("Player not selected")
			else
				game.Players[PlayerSelected]:Kick("Kicked by an admin!")
			end
		end)
		
		Main.PlayerData.AdminTool.MouseButton1Click:Connect(function()
			--ignore this
		end)
	else
		player:Kick("You shouldn't have access to this panel. If you found a bug, please report it for possible in-game items!")
	end
end)

Basically, it doesn't work in-game. I'm trying to make an admin panel but now it doesn't work. Everything works fine on Studio but not in-game. The game is FE, so maybe that's a problem? If so, how would I make this compatible with FE. This is a server script in ServerScriptService. I know I could use Remote Events but I feel it's not that safe... I wanna have it serverside