Mora Mullvad seems to work ok
If Mullvad works okay to you then there isn't really a problem with continuing to use it instead of looking for other options - it is really popular. But if you want to look for other options as well:
Mora I have not tried IVPN yet.
IVPN using OpenVPN with TCP 443 was suggested, they also have a few other ways of circumvention that you might want to try. IVPN is very popular.
Mora Proton however in my testing was not able to connect when the config was left on auto. I have not tried IVPN yet.
It's been mentioned in this thread before but set your Proton VPN config to 'Stealth' if you haven't already and you plan to use it another time - that is their WireGuard through TLS port mode. Just want to put in my two cents and say that I've had no problems getting through public networks, academic networks and some restrictive corporate ones with this mode. Sometimes the app doesn't select that mode when it is in Auto so I've had better luck just choosing it manually.