Wouldn't say there's anything comparable to how airdrops used to be (fairly profitable for time put into it)

Can't suggest much aside from part time online work (Like lionbridge, Leapforce) which pay about £10 an hour for fairly mundane work, about 10-20 hours a week. That's nearly a grand a month one could put into crypto.

Mturk is okay - lots of little jobs that pay fractions of a £ - can make about £5 an hour until you specialise (after few months) - can then go up to about 10. If you know any languages you can do online transcription work and make quite a bit of cash (10-25 an hour).

Fiverr also works, presume you know about that as is fairly well known.

Not sure what else to suggest really.