Trading need investment and without that, you can't trading! So commonly you can't generate money from trading without investment. Besides bounties and airdrop could be an opportunity cause you don't need to investment there and there is a good chance to and good amount of money if you can find out good project. You shouldn't join every project randomly. Where are you need to have some analysis yourself, gain knowledge about Crypto, Read blog or YouTube videos will help you to analysis and gain more knowledge. I recommend you to rejoin airdrops and bounties again cause I will there will be many upcoming good Projects due to bullish session.
Trading requires money while investing is your choice, because when you invest but don't have money then you can never do it. Bounties and Airdrops are only a small part of getting additional capital, but you have to know that these two methods cannot provide a guarantee of getting money quickly and sometimes what we do is not paid according to the effort we have made.