You could either
Use the /god command Install a gsc script like a mod menu Use a software in LAN modeIf you are online and inject cheats then you're banned because that's what cheaters do.
The only way for us to be sure you won't cheat online is to disable the online functionalities with the LAN mode.
You need to wait for your ban to expire and do like I said above next time
You can simply type /god in the console after activating cheats with the cheats button in the lobby or use a mod menu next time, without going in LAN mode
https://forum.plutonium.pw/search?term=mod menu&in=titles&matchWords=all&categories[]=23&sortBy=relevance&sortDirection=desc&showAs=posts