Besides procedures suggested by Apple when running into Wifi problems some additional measures can solve issues for newer versions of MacOS and/or Apple hardware (from here on just “Macs”):
There is empirical evidence that newer Macs do not play nicely with the implementation of WPA3 in some routers. Check wether there is a firmware update for your router and install it, at least restart. WPA3 should be configured on your router to grant access to a WLAN, but if you observe connectivity problems, switch if possible to WPA3/WPA2 transitional (or similiar name).
Consistency of your Wifi connection can be impacted by the default MTU size used by Macs. Changing the MTU size to 1453 (via System Preferences>Network>Advanced>Configure>Manually) usually solves this issue.
Additionally turning off Private Relay on some Macs improves the stability of the connection.
Lastly it seems to help to overwrite the airport preferences and network settings. You can achieve that by setting the MTU or turning off Private Relay,etc. Or you just delete a related plist(s) and force the OS that way to write/save them again according to your adjustments in the System Preferences.