Now I feel bad for him. So I'll say the same thing mo' nicely:
Rap battles constitute a small portion of this site, and the overwhelming majority of the participants are only on a couple of threads. So posting new threads asking for feedback is mostly a waste of time, because almost all your potential audience is already on the thread you posted your rap to. If it got missed in all the other posts there you might ask someone there to have a look but bumping too much might not go down well with them either.
In general, bumping too much is annoying on a forum. But you can do the same thing by adding more substance so that it's not just "check it out" or "bump" etc.