I heard there is a way to get instant level 100 characters in the steam version of the game does anyone know how to do this and is there any other things like this you can do?

Beside hacking. No. It honestly don't take long. Usually takes me 1-2 weeks. If we ever manage to be on at the same time. I can help you out with ideas and xp gear.

Yea google has all the answers

Only by mods (exp multiplier mod or such) or by console cheats

Run synergies and lvl in there. No need to console or cheat at all.