If this was the only league you bowled then you will probably have to participate as a scratch participant in any handicap league. It may benefit you to try and get 21 games in a league as a sub or fill an empty spot to generate an average for tournament use.
Also, check to see if you paid sanctioning dues in this league (local, state or national) and be refunded for any moneys you paid.
If it is not the only league, then you will have to pretend this league didn't happen.