Currently which is the best campaign to join can anyone suggest....
Let me remind you about this quote "Many times what we perceive as an error or failure is actually a gift. And eventually, only we find that lessons learned from that discouraging experience prove to be of great worth." meaning you have to accept that failure as good experienced to learn.
I also experienced the same though it's not in a signature campaign but from social media campaigns and it feels so bad thinking that we inserted a lot of effort and time dedicating it for that project but end up nothing we get.
I wrote an article to help other bounty hunters and investors to choose a good project with the high potential of success in the future, here are some tips a bounty hunter/investors must do, we need to make a background check from different angles. A great project must compose of a great team, a solution to a problem, usefulness of blockchain & token structure, professionalism, presentation and activity, partnerships & hype. If you see a project that has this factors then it has a high percentage of success.
Study the project on yourself and do not rely on what others are saying instead add what they say as a basis for choosing the best one!