Clickbank is also a very popular and big affiliate platform with a lot to promote, you should check it out. I think clickbank and amazon are the 2 most popular affiliate platforms that have been around for a long time.
Or when you want to earn more crypto you can do bounty hunting. By doing marketing related tasks you can earn cryptocurrency. It pays a lot more than airdrops. I can recommend Bounty0x for that purpose. You can register for free here: https://beta.bounty0x.io/register?referral=effb68 It's the best bounty hunting platform out there.