Can you expand on how to do opsec? Should I start using a proxy to browse? Is it possible to trace the IP of users, if not by feds but by chuds?
If you post any images from your phone, clear exif data first.
Even with a proxy, you might be trackable if someone links to a honeypot site. Check https://amiunique.org/fp for all of the data a server receives before it loads a webpage. That data can be collated with commercially available data sets to get personal information.
Best practice is still to clear this (and any other potentially identifying metadata) before upload in the extremely unlikely event that someone tries to MITM you.