It is not just about uploading music, but uploading the kind of music people want to buy. I had a hard time with that concept at first, really writing whatever I wanted. I then came to the realization that I need to write to the markets needs, not my own. Since then I have sold a few tracks on P5. I would say to temper your expectations on what you can get. I am still very new in production music, this is the first year of pushing myself into this. (started my changes in August last year). I am going to do it for a year and see how well I do and evaluate what changes I need to make going forward. The point being is that I am looking at this with a long game in mind. So give yourself time to grow and promote your material. Best of luck! Cheers!