The dollar will keep devaluing long term, not just because of the inflation and the printer go brrr, but also because the most adequate world economies are giving up on it as the reserve currency. Euro, yuan, even the Russian ruble if you feel adventurous, and of course gold.
Nah nah what you want is Nigerian nairas, they are cheap af rn so you can buy a lot with USD and when Nigeria's population starts to really start booming they will have a bigger population than the USA. Then you can make good money off this long term investment.