Renew SSL Lets Encrypt txt not verifying

You add this txt record _acme-challenge.mydomain.com with your domain dns panel. And its not validating after several hours, that case you can remove this TXT records and add it to your hosting dns zone. If you use clouflare then add into DNS zone. Sometime domains DNS zone record not properly matching but Hosting DNS records matches. I am successfully added all DNS reocrd of my https://nearmeads.com website and Let's Encrypt certificate installed correctly and renew also. You can check my website DNS record for reference, it will help you.