Most legit way to earn is to get a real crypto related job. And you can also do the bounties or airdrops, but only as part time as you will have no table income doing this.
Airdrop and bounty at this time will not give you the income you want. Many airdrop scams do not pay participants, even if they pay with tokens, they cannot be sold because there is no exchange for these tokens. Just like the gifts that exist today, full of scams and projects always fail.
some of the best ways to get crypto are by following a signature campaign on good projects with BTC payments or being able to trade, but need to know technical analysis and fundamentals in order to read market directions.