If you already declined all other schools, only SIR’ed CMU, then people doesn’t need to provide more advices. I know you’re waitlisted at UCLA/UCB, UCLA had two waves for CS two weeks ago, pretty much done, and even less chance here.
You can get more accurate & targeted anawers from the paid services. You don’t have to listen to the noise of social media.
Again, CMU picked you, take on the challenge.