[Quoth]

You may need a different ISP if you want to remotely access your home. Is "T-Mobile 5G Home Internet service" also supporting IPV4? Do they use NAT for IP V4? Is it really a mobile/cellular service? Note "5G" is not broadband, no matter what band it uses or how fast it is.

So forget about direct home access, tunnel or not if you don't have cable, fibre or xDSL.

Hosting anything via mobile (any version of G) is very difficult to nearly impossible. The only way to make 5G work like broadband is this:
1) Have a hosted website.
2) Use rsync or similar over SFTP or similar on home PC to update or read the hosted website. Connections only initiated from home to the hosting, so no port forwarding needed. Works on ANY internet connection.
3) Only access your hosted website when out from home.

No tunnel needed. Even if you have symmetric T1 and and static IP, or fantastic FTTP with 50 MBps or 100 Mbps up from home and 500 or 1000 Mbps down (remote access is limited by home upload), using the hosted solution (about $100 pa) with rsync or similar running from home is better.