Hello,
There may be issue with item you are selling. Make sure, you just list item quantity 1 with item price below $500. Selling limit will be reinstated after one month of first listing created.
If you have listed items on ebay US before, any how if item sell or do not sell but GMV will be considered.
If buyer won't pay, open unpaid item case and email to customer support and they will reinstate your selling limit.
If you have not linked your paypal, kindly link it. with PayPal link to account, it will increase your limit somehow.
Some people can go their whole lives and never really live for a single minute.