There really is no secret method out there. Sure there are some very small alt coins which you can mine however there is no guarantee that they will do an 100x. And the daily profitability of those coins is slightly less than mining ETH directly.
If some new coin and algo comes out then as soon as it’s listed on one of those “ whattomine” website and it shows as slightly profitable than ETH you will see the difficulty sky rocket because everybody wants a piece of the more profitable pie.
Mining is extremely difficult these days. More difficult than in any of the previous cycles.
Mining gets extremely difficult once a coin is listed on exchnage (more miners jump in and complexity goes up) but its fine to mine a coin before its listed on any exchnage. So try to hunt coins that can go up in future and mine them.