Help me get better, I was rejected

Here is the preview:
https://youtu.be/kvd9tTZmeWc

Here is the email:
Thank you for your submission. We have completed our review of “Logo Drop Court Shatter” and unfortunately we found it isn’t at the quality standard required to move forward, and you won’t be able to re-submit this item again.

I don’t want to invest hours in making content to only be rejected without any feedback. If you have a moment, help me improve.

-Wes Koetje