Check out this Russian Telegram channel on AP https://t.me/usadminvisaprocessing/1

There are people who file collective mandamus lawsuits, so you might consider joining one of those groups.

However, from what I've seen, it could be a waste of money, as there isn't convincing evidence that it accelerates AP. These lawsuits usually take many months, and AP often resolves "by itself" before the lawsuit reaches a resolution.