There were a few altcoins bounties last year from which I had earned a lot, can't remember the exact amounts but I had joined most of the bounties and I had earned a lot of money through bitcointalk from these bounties. I hope there will be another good season of the bitcointalk bounties in the future, so we could take a profit from it.
May be you worked in hundreds of bounty campaigns otherwise its quiet difficult to earn good amount of money from the bounties, because a lot of participants also very low allocation in every single bounty campaign. I think bounty era ended from 2017, and which time will never come back, so even i didnt expect good time will be come in the future.
Those are the golden era for bounties though until now some projects are being so generous and giving out a lot of bounties to every participants. I remember earning around $100/month before, and that could be my biggest profit from bounty aside from participating on a signature campaign. Signature campaign now are more stable, youre lucky if you can get to participate on a long paying campaign.