now i start joining airdrops and bounties
Yeah, good luck with those. With the ico market dead (or at least dying), I have a feeling that bounties are going to become fewer and fewer, just like signature campaigns declined in 2018. And you're lucky if anything you get from an airdrop holds any value before you can sell it.
I would say that if you're not mining anymore and don't plan to ever again, sell the rig. But if you have any reservations about not mining again, keep it because you may change your mind. You never know if altcoins are going to explode through the roof, and mining might become very profitable again.
Most people are very slow to adapt to the new circumstances in the market, the strategy of using bounties and airdrops to try to get some money was effective during 2016 and 2017 but now during the last two years those strategies are just a waste of time, this reminds me of the time in which people used to try to get money out of bitcoin faucets and there was a time in which this was mildly profitable but now it is just a waste of time.
And it seems to me that bounties are following that very same path and I'll not be surprised if in the future many projects decide to not use bounty campaigns to promote their project.