Deductions & credits

I got a 1099-K for for California it had only 9 transactions for 2021 and less than10K in sales.  it was listed by a third party seller that I was using.  Do I list this these were cards I paid more for by grading and buying etc.  Can I do  a loss on this for grading or buying the cards for less than I paid for grading is is $264 a card.  Do I just key this in to turbo tax will it be able to take a loss or do  I pay taxes on it.  I am a small seller not a business I try to make the cash for bills?