Lots of ways you can earn crypto but it will depend on your dedication to do the task since its not easy to earn those cryptos especially if you are doing nothing. But if you want to try out some methods that potentially can give you some decent gains then try this options.

Airdop
Bounty task either signature campaign or bounty campaign in this forum
Providing Services to people
Mining
Trading
Crypto Affiliate marketing
Social media task or jobs(Crypto Freelancing)

If you can do one of these options then provably you can earn decent money from crypto.