Now its 2021,
Most if not all new coins are not really coins, they are tokens either on ETH or BNB blockchain. You can't mine these. You can only buy them. And if there is some new coin released which uses the ETH algo or some other similar algo, there is a 95% chance it won't get listed anywhere decent and have any decent marketcap, hence no point in mining it.
Mining is tough these days... no secret out there really.
Yeah, we have before and after eth smart contracts, before that, proofofwork/mining used to be a thing, after that, tokens, defi and ntfs, value from nothing, created doing few clicks have become a thing. I advise any thinking long term to never hold tokens, defi or ntfs for that matter. Legit stable tokens like usdc and few others that are audited time to time are all right. Holding an unknown coin short term is all right too, for example I have been mining raptoreum with my ryzen 5900x time to time for fun, 4.0ghz 18 threads using 80 watts, voltage 0.9v hehe