Coming back to gw2
I would keep your pre-made and just roll a new one and try it out, then you possibly won’t have to do as much to catch up once you get re-familiarized.
keep ur engi no reason to re roll ^^ making a new character to familiarize ur self is a good idea when u learn everything again u can always go back. however there isnt to much tht u missed ^^ if u ever need someone to play with u im willing to make a character to help out if none of this makes sense im sorry ;-; i have a fever