Bad take

1. You only have one country (the one you run your vps in).
2. Costs more than any vpn provider (which come with many extra features out the box).
3. You are not maintaining your OpenVPN installation and having to is likely a pain for most people (you said you “can’t even remember how to login”, which tells you me are not updating your servers OS or OpenVPN itself, which is leaving you open to vulnerabilities in the old software).

There might be advantages too, but I can’t think of any unless you are gonna use the VPS for other stuff too and creating the vpn is basically free then (but I still wouldn’t do it personally).