After you file

So I got the actual form Onlyfans sends out regarding income. But I did not get it until after I already filed. This is around February 9th. Fast forward to no. The irs sent me a letter stating they are holding my refund for multiple possible reasons. I’m assuming it’s because of my onlyfans income not being reported on accident. The letter said it could take up to 60 days for them to review it. So do I wait to see if anything changes since they sent me that letter or do I amend my return and send it in?