If you are gonna for long term , it would be better to not go for alt-coin , select btc for long-term and now it's running in a good dip position.
On the others hand if you wanna trade short term with alt-coin .Then select the top rows of alt coin without selecting more coins- such as bnb ,Etherium, matic, ltc. 12k isn't a small amount . You can make good profit by doing day trading by reading the candles