Wifi vanished from Network

Remove the add-on VPN, restart your Mac, restart your Wi-Fi router, and try again.

Add-on commercial firsr-few-hops VPNs can cause all sorts of weird problems, beyond the obvious capabilities available to the any of the folks interested in centralizing and collecting all sorts of data from VPN users.

Have you rebooted? if not; do so. If that doesn't. work start in safe mode and let it sit for a few minutes then restart normally and retest.

Start up your Mac in safe mode - Apple Support

When all else fails, reinstall the OS. Have you considered that?

Of course you could have a hardware problem which diagnostics might detect: Use Apple Diagnostics to test your Mac - Apple Support

Are you certain your ISP isn't experiencing an extended outage?