The best time to promote bounties are on altcoins season ,if you are tired of one delay after the other just quit till altcoins season returns ,this is the reason why 2017 was the best year for bounty hunters
Hmmm. How do we exactly know when is this altcoins season? So far, we can't be 100% certain when is the good time to promote bounties. Because even the projects you do not expect to do well end up doing well. I just conclude that promoting bounties is just grace. The one to pay you will definitely pay you huge.
In my own personal opinion, there are no such thing is the best time for promoting projects because anytime is the best time to promote a project, as long you are appropriately and uniquely promoting your project to attract and invite investors, but for now it is not the best time to promote projects because most investors have stop participating in projects due to scams.