Rate limits and how to obtain a increase is noted here
But you don’t need it
I don’t. I can happily handle a 30k stack of viewers.
Because when I do a fetch of 30k people, I already collected most of them on the last time I collected.
And I don’t have a increased rate limit. I do use a App Access Token so I get 800 points rather than 30. And I lookup 100 users at once.
And that reduces the request count I make