You said you have a router from your old ISP that is going away when that ends, or did I misunderatand that part?

An RPi can function as a router…sort of. It will not be a very good one though. Putting your network services on a device like the Flint I mentioned gives it all kinds of benefits over an RPi:

• many Ethernet ports
• ability to reassign hardware ports
• hardware acceleration for network traffic
• WiFi 6 (for that particular model, W7 for the newer)

I can go and on with that one. RPi just doesn’t have the power to give the same kind of performance, especially since you mentioned having gigabit internet.