Hello!
Just to avoid potential confusion, the limit is 5 ports per account. Only accounts registered with the earlier contractual agreements can still enjoy 20 ports, i.e. the change enforced on June 2023 is not retro-active:
https://airvpn.org/forums/topic/56405-port-forwarding-availability-change/
We are finalizing a deep infrastructure change, started more than 6 months ago, which will avoid port exhaustion for many years (we guess for the whole company lifetime) and which will allow us to offer more inbound forwarded ports per account (if needed) at a fair price. The change will not rely on "regional" or "server group" ports, so the comfort of the current system will remain.
Kind regards