Depends on what type of person you are in this industry since if you can build a business which can help people interms of their daily usage then provably you can earn with that passively, but if you just rely on service earnings or tradings then there's no way to have a passive income since all of this is totally a gamble.
You can join DEFI with Bitcoin, many DEFI platforms allow staking WBTC (BTC encapsulation based on ERC20 tokens) and receive interest, where you can sell them and buy more BTC.
Currently, scam DEFI projects are taking place on a large scale, so please only participate in reputable projects.
Defi's still no guarantee since some of them are still the same with the other who are undergoes with pump and dump scheme and also turns scam so its really hard to get a passive income with this but we can get a good fortune on it if we research some vital details regarding on the team behind on which exchange would possible it landed since top tier is one of the best reminder that they will got a good future or atleast it can give us a profit for buying them.