I setup my domain name correctly, it was working fine at first but now the root domain https://example.com is not working, only the subdomain https://www.example.com is working fine
I'm using cloudflare for my dns record management I added these correctly CNAME www cname.vercel-dns.com A @ 76.76.21.21
The domain troubleshooting guide can help with most custom domain configuration issues. You might be able to use that guide to solve it before a human is available to help you. Then you can come back here and share the answer for bonus points.
https://vercel.com/docs/projects/domains/troubleshooting
You can also use v0 to narrow down the possibilities.