I can't still believe people are doing airdrop up till now, I can't remember how recent I engaged myself with airdrop campaign or free rewards earnings. I think you don't have to enroll yourself by doing those task because it would still end up by wasting your precious time, and the volume of participants involved in such airdrop are too voluminous whereby after event ends and rewards may not possibly go round to everyone who took part. What happens is that most at times, only the first 100 to 500 participants are being selected for the rewards and some may not received while some will receive a token that can't be exchanged. After all this stress I decided not to involved myself with airdrop anymore.. all less in some cases where they could only requires some high rank users to partake. Airdrop bot is one of the worst airdrop to partake, because they are being program to receive all your entries and if any is missing it can recorded as an invalid entry whereby you won't get paid for the task.
Well, looks like we all have bad experiences with airdrops. But the fact is until now there are still very many people trying to take advantage of airdrops to make money. you can see it in the telegram group about crypto. That's because doing tasks from airdrop is easy. Even though it feels like a waste of time, based on OP's experience, he once received 10 airdrop payments per month, and maybe out of 10 coins, 3 of them could be sold, and the rest went to waste. yeah, it's sad, but for the people who just joined, it looks like it could be a good start for them. well, I also started to explore crypto since getting to know the airdrop. But the current airdrop is very different from before.
Anyway, to the OP, it looks like it's time to look for another task that might be more profitable, and not take so much time.