Since you have $20000 dollars to invest, you must carefully build your portfolio before you invest. You can't invest as much as you want because your dollar amount is too high. So you can invest in different altcoins while keeping Bitcoin as the largest part of your portfolio. In this case you can check and select from some of the best popular points in the coin market.  In this case, you can select Ethereum, SOLANA, Near all these coins by checking well.