Updated to Ventura 13.4 but still experiencing the same issues for the wifi (2.4Ghz).

The 5Ghz one is worse (dropping more often for longer durations + sometimes encountering this error "Your Mac successfully joined the Wi-Fi network, but cannot reach the internet.").
None of my other devices (including iPhone, MacBook, Windows laptop) are experiencing issues like this at the same exact location.
I have contacted Apple Support (online) and they could not figure out anything. Later, I have arranged for a Genius bar appointment at the Apple Store, but the wifi isn't dropping at the store and they could not replicate the problem there. I have informed the Apple Genius Bar team member to refer to this particular thread, and make a note of it when he sends the Mac mini to Apple Repair for further investigation. 3 days later, I picked up the Mac mini and they told me that they could not find any problems.
I have already tried the suggestions mentioned in the thread (eg. the AWDL stuff, changing wifi channels in the router settings) and those did not help either. I totally regret not returning the Mac mini when I could have done it, incorrectly assuming that it is a software issue that Apple would be able to fix easily. And wifi randomly dropping like this is making this Mac mini almost completely unusable...
Does anyone else have any other suggestions (besides using the ethernet)? Thank you