an altcoin that is not yet in the top 500, because it has the potential to make my $500 into $5k or even $50k, but of course the risk is definitely big (high risk, high profit) and altcoin that I recommend is UMB, because I see this project as a hidden gem, so when the right time comes, then the price will definitely increase very high, so of course UMB has a good potential to be used as a long-term investment and can make me rich, but if you want to invest in UMB, then I still advise you to DYOR before investing in UMB.