The full fix for me was to actually replace the ancient request library with passing a more modern http client (in my case undici) as a custom request instance. After that every single steamcommunity call worked as expected, I assume that steam just updated their fingerprinting so older http clients like the on used by the library gets flagged and u get back a 429. For the custom request instance you basically just have to copy and implement the functionality that the libraries own request instance implemented but with with a bit help of LLM this is very easily done.
