One last thing. I assume you checked if your DNS changes got propagated? I tend to use DNS Checker. And even if the changes are propagated, it can sometimes still not work because of DNS cache in

• your browser
• your pc
• your router

So assuming that you checked the DNS propagation and it was propagated enough, I’d also

• clean all DNS caches from browser, pc and router
• try different, large DNS provider (Google, Cloudflare, etc.)
• try it on my phone over mobile network and not wifi