I wasn't quick enough to answer @vsq, but I'd really like to know, as a false beginner, isn't renting a VPS server considered as selfhosting? Even if I have all my services on it (Jellyfin, n8n, Immich, TeamCity etc).
My app and DB are on the same server, even more the same Docker Network.
Environments separated by region seem to be the best solution for my use case. I hadn't thought of that at all, thank you very much.
The hyfen stalled in front of the exclamation mark ! Joking aside, thanks for the recommendation, I thought it was all one word.