This is the most important aspect that AJ has to improve if they want to add diversity and encourage new people to improve, keep learning and posting until good results are achieved. Otherwise, there are those who know (and successfully post and sell) and those who doesn’t (and find it very difficult to improve).
It could be simply a matter of giving more precise feedback related to sounds (samplers, synths, recordings), composition & arrangement, and mixing and mastering. It could be using a star system:
Sounds: ***
Composition & arrangement: *
Mixing & Mastering: ****
Hence, that person knows that she has to improve composition & arrangement more than the other areas.