This. I was getting fits when I read the post. Fiber is actually great for selfhosting a service but the security side is very dangerous for uninformed individuals.
If configuring an nginx server is already stretching it, its only a matter of time until your stuff is encrypted and ransomed. Same goes for all data in your network. If the pi is not in its own zone, it has now become a door to your network with barely a lock, let alone a good one.
I would highly recommend reading up on network security and probably prioritize isolating the pi and making at least daily backups.
You router is going to be scanned for open ports every couple minutes. If the wordpress doesnt have a strong password, you‘re in for a bad time.