Bounties and Airdrops are giving really low profit nowadays. Still, there are some worthy campaigns, but it is better to switch to others way of earning crypto - running nodes, for example.
You will not have too much profit when investing in masternodes, you can even lose money with it when the market collapses. I have invested in several masternodes projects, but after a period of operation the price kept collapsing and I could not profit from it.