Well I'm all set up to go on Audiojungle and Pond5.
I submitted the same 5 songs to each. I've had one rejected from AJ with a 'copperplate rejection text' which meant the issue could be anything from song type/arrangement/length, technical things like mix/mastering etc.
I pulled the other 4 from AJ (so i can rework and resubmit them) but let all 5 run through the review process on pond5 to see if i got any better feedback, I didn't. All 5 got rejected with a similar 'quality doesnt fit' text.
I really didn't put any effort in ... all i did was push some old pre-master song files through an Ozone 8 preset. So i wasn't too surprised.
Ive since spent some time listening and downloading (the free previews) from AJ and it's obvious my mixes and masters were not up to scratch and submitting 4 min plus songs is not ideal either. The best is 2 min and it's worth paying attention to the arrangements too. Very little intro/outro and not too much contrast or change for the top sellers.
I've now written a song especially for stock submission and using the reference tracks has really helped me improve, especially with mastering. They really push the mastering loudness and the high frequencies beyond what i would normally do. Loud sells. So mine will be loud too. Also the bass is crushed to let the tracks be louder.
I've also worked much more to a method so if this song gets accepted i can hopefully 'turn the handle' more quickly.
All in all, so long as i get some tracks accepted soon I'll be happy. People have been telling me for years i need to reference my tracks (hi Peter) but i never listened. Now i have started and my music will improve for it.