Setting music prices

Hi all,
i started on 05/2021 ..i have upload about 50 music track, most of them is background music.
I set my price very low to 5 dollar because it's my hobby, i am not a pro, so my music for sure has limits...
I sell about 5 or 6 tracks mainly in the last month..and i decided to be exclusive (because AJ reject all my tracks)..
and i set the price to 9...(2 days ago e zero sell till now..)..
Is on your opinion the price still too low ? what should i put ?
and why if i put my track on 9 euro ...they sell at 8 ?..
and the how a music can be put on the Membership or Select ??
If you want to check my music to give some update this is my page..
https://www.pond5.com?ref=CoinMusicPlus
thanks again

thank you all