Can't connect on PS4... HELP!

Hi everyone, thank you for taking the time to read this. I have been playing COD BO3 on my PS4 for the past 6 months now without any issues. But a few days ago I stopped being able to find multiplayer matches eventhough I know the lobbies are active.

I have disconnected and reconnected from the WiFi, I have ran connection tests, rebuilt the database, restarted the router....but nothing seems to fix the issue. The network connection tests say my NAT type is Type 2 and there doesn't seem to be anything wrong with my upload/download speeds.

I can occasionally join via people who I have recently played with, but that's it, I am never able to join a game just by searching the normal way.

I have been scouring the internet for answers and I have tried everything, apart from connecting my PS4 to the internet via an Ethernet cable. This isn't possible for me because the router is in a different room and I can't buy an extension hub because I live in a rented property and the landlord controls anything to do with the WiFi.

I have ran this set up for months, I have never had any issues with connectivity or the wall creating interference.

Please if anyone knows the solution can you help me out, I am a burnt out student who just wants to be able to wind down and play my childhood favourite game but now that's been taken from me :(