Bounties altcoins is the correct board.

The high number of threads in that board does mean that it is difficult to have people find your thread only by visiting that board. You may want to otherwise promote the threads you are running either on a thread with a list of campaigns you are running that is independently promoted (perhaps via advertising) or via a website that is promoted.

I think it would be a good idea to somehow index threads on that board and make it so you cannot get your thread to the top by someone posting.