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