Choose one of the coins that uses RandomX (or variation) mining algo:
QUANTUM (QRL), LOKI (LOKI), MONERO (XMR), WOWNERO (WOW), ARQMA (ARQ), SAFEX CASH (SFX) ...

A potential source of income could come from brand-new coins in their initial stages, before more powerful machines are pointed at the network:
Evolution (EVOX), Morelo (MRL) ...

https://www.cryptunit.com/newsid/157-top-coins-to-mine-with-cpu-randomx-april-2020