Make it more accessible. Like in the above post - you should have put a REALLY EASY, no-brainer link, that explained exactly what the this whole thing is about.

Also, you didn't explain at all what Sphinx is. And you said, "remember for 2021" - well, I'd say probably 99% of people do NOT remember, and so you've lost them.

And here - it says "no featured bounties at this time": https://community.sphinx.chat/bounty/. That's even more prominent than the link to actually see the bounties. It's confusing.

In the "if you want to earn bounties" - do you really need to make things complicated by giving 5 separate steps? No. You need to make people excited about the opportunities, and eager to find out more.

Read the book "Don't Make Me Think". Constantly think of the principles in that book, when communicating.

Also, I'd suggest going to something like Fiverr. Find some iOS developers on there. Pay them some money, and ask them to review the materials you have, trying to induce people to try for the bounties. Ask them why THEY wouldn't want to try the bounties.

And you may also need to promote - like actively market - this. It may just not have enough visibility.