They are literally multiple ways to make money in this space, but one need discipline to be successful in them, most people usually rush into all this means without any proper ideas all how it work's (which is bad).
Some of these means are trading, investing (holding token for long-term profits), Airdrop farming , arbitrage etc. all these means are wonderful means one can use to earn money from this space , some requires one to have a capital, while some don't ( like airdroping) . But all need discipline to be successful in it though is not all about doing them is all about putting in the work .