Welcome to the Forum, @EBD123!
That seems like quite an ordeal you’ve been through, and I’m trying to noodle my way through what happened.
What happened when you tried to log into your original Wyze account? Are you still able to log in via the Wyze Web site (like, if you you wanted to check your account profile, previous orders, etc.)? If you can’t log in there, then what happens if you try the “Forgot password?” option?
I realize that you’ve already done a lot of changes (new Wyze account, resets of cameras, changing the SSID and password on your router’s Wi-Fi network), so I don’t blame you if you want to proceed with the new Wyze account, but one concern I have is with your access to any data associated with your original account, so I’d try to gain access to that if possible. Of course, if you do that, then you’ll need to log out of the (new account) Wyze app and log in again with your original credentials.
Having said that, I think it’s important to make one distinction about the advice Wyze Support gave you:
Sometimes people confuse “5G” (fifth-generation cellular network) with “5 GHz” (a frequency used by some Wi-Fi networks), so it’s important to be clear that what you want to do in this case is to make sure your phone is connecting to your router’s 2.4 GHz Wi-Fi SSID when you’re trying to connect your Wyze cameras. There are some Wyze camera models that can connect to 5 GHz Wi-Fi networks, but none of the models you listed are in that group. You want to be sure that your phone is only on the 2.4 GHz Wi-Fi, so you may want to turn off your phone’s mobile data temporarily and disable the 5 GHz Wi-Fi radio/SSID on your router in order to force your phone to use the connection you want. After your Wyze devices are configured, you can re-enable mobile data on your phone and turn the 5GHz radio back on in the router’s settings so that any devices capable of using that (likely your phone) have that available again.
This Help Center article might provide some additional information:
If none of your cameras are permanently mounted, then I’d also start with one that you can take to the router’s physical location (so it has the strongest possible Wi-Fi signal), plug it into power, factory reset the camera (as @dave27 noted), and begin the setup procedure from the beginning as if it’s a brand-new camera—after ensuring that your phone is connected to your router’s 2.4 GHz Wi-Fi network. If you can connect one camera to your network, then repeat the procedure with the others (as much as you can; I imagine you’re not going to un-mount the doorbells and try to wire them to power near your router).
Really, though, if you can still access your previous Wyze account—and if you have meaningful information connected to that account—if it were me, I’d try to reconnect everything to that account.