This is the real, unfortunate truth. There are simply more tracks than buyers for them. When AJ was small, tracks that were similar often just drifted off the front page and into the deep ocean of 1 sale tracks, never to be heard from again. Now that AJ is huge, it is becoming overwhelming, and everyone’s music is devalued as a result. (I’m not even talking about so-called “low quality” tracks-- I’m talking about tracks in general).
I don’t like month-long review times, but unless you want year-long review times, they have to stop the flood somehow.
A suggestion I’d make to anyone worried about not being able to do “full time AJ” would be to find other RF sites on which to sell your items. There are plenty that will take your music in huge numbers.