Hi all, I need help, serious.

My imac has been using TM-UNIFI wifi for many years, recently I terminated my contract with TM and I subscribed to Celcom Fibre

Ok, the first 5 days I was able to connect to the new Celcom Wi-Fi and at the same time able to connect to the old TM-UNIFI WI-FI, all good, no problem

After 5 days, which is yesterday and today, I can't connect to both new and old Wi-Fi in my IMAC, no matter how I try

* the Celcom Wi-Fi works fine in my handphone

I thought it was my iMac WI-FI damaged, I switched on my handphone's hotpot and I connect it in my iMac, it works.

So, I confirm my WiFi of IMAC is not damaged, it just won't connect to the new Celcom Fibre WI-FI

I have done Google search "mac wifi connected but no Internet" and
tried all the possible solutions, still not working

Sifu sifu, please help me

do a forget connection on imac and do a new pairing. and check modem/routing setting on wlan channel.

Modem/routing settings on WLAN channel

Is this in the 192.168.1.1?

I have tried all the below methods, still not working