I find the
Services section is typically one of the better places you can go to for copywriting and content writing jobs (As well as a lot of simpler tasks), though a lot of the other sites near the top of the list in the OP also look pretty good. The
Jobs4Bitcoins subreddit that's linked in the OP might also be a decent place to take homework-related tasks since I find a decent part of the Reddit demographic is younger people.
I am also looking for an opportunity to check opportunity in the service section as I know that we do have a lot of opportunities there. Anyway, also when I do have time, I am having my own search in different crypto projects, just like being part of their marketing team, handling their social media accounts, and many more.