I have very limited interactions with Uighur or Tibetan so I said I'm not expert on the issue.

This guy has traveled in the Xinjiang/Xizang area and might give you some basic idea what that region is like: https://www.youtube.com/watch?v=L5t2sLWuYyc (the first video of his travel within China videos, there's no playlist I think)

If you know enough Mandarin, you can probably find some Uighur Tibetan people on Chinese social media like douban.com

Also some westerners live in the Lijiang / Dali region where there are many Tibetans https://en.wikipedia.org/wiki/Lijiang https://en.wikipedia.org/wiki/Dali_City

I've never been but heard they are nice to visit.