First of all, don’t use CentOS, it’s 2023 (and EOL)

Second of all, you can abuse the AWS free tier to host your VPN since they assign a dynamic IP for all the ec2 instances, so turning it off and on again gives you a new IP.

Also, don’t use OpenVPN, use WireGuard.

EDIT: Additionally, I believe that when they notice all traffic originating from your IP is going to a single IP somewhere else in the world it’s automatically marked as a VPN and then blocked. You should try running a split configuration where traffic to lemmy.blahaj.zone (23.20.240.121/32, 54.81.97.116/32) is routed through your VPN and everything else leaves as usual.