As mentioned here: https://www.realmicentral.com/2021/10/28/google-pixel-6-and-pixel-6-pro-allow-you-to-disable-2g/
The stock Pixel 6* have a switch to disable 2G. Does GOS have a similar switch?
I know GOS has a switch to enable LTE only, however, this will kill voice calls if the network operator does not support VoLTE for the handset, and the pixel handsets are not well supported outside of Europe or the USA. I experienced this first hand with my Pixel 4 in an asian country.