When we go to yoursite.com/ads.txt, we can still see an old Ads.txt file with different entries. You'll need to delete that file or add your Google AdSense entry to it. You'll want to check if you have any related WordPress plugins. If not, check with your host to make sure they're not caching anything inadvertently. They should also be able to help you delete files. We have no control over your site because you disconnected it like you said.
What was the issue with the site to begin with? What prompted you to switch to AdSense? You can just set up AdSense Mediation through Ezoic.