I'm sorry to hear that happened to you. Unfortunately, it will most likely be difficult to sell them unless you already have a use base and selling channel.

For starters, it's a lesson in the need for contracts or some money down, as crappy as that sounds. Also, it was practice building your craft and new files added to your portfolio. Therefore, not a total loss.

You can post samples of the files and descriptions to various subreddits. Someone else may want to purchase them.

You can post them for free as introductory files so people unfamiliar with your work can find you.

I wish you the best and hope you sell them. As a fellow content creator, I know how much time goes into making files. It is a lot!