Most likely the coins in the top 100 ranking in Coinmarketcap website,you can't go wrong with any of them but just to be sure you can narrow down to top 10 to top 30 and you will win quite a lot of money if you start mining right away.In this scenario we don't care that you are mining at a loss as you are in for the next bull run so you can turn on those GPU-s no matter if they are well over 5 years old,in the end this type of experiment I am confident will pay off much better so as long as you have money to pay for electricity even from your own pocket like I did in 2018,you will get rewarded.I did the same in 2018 and in 2021,February Bitcoin at 60.000 I was a happy man.