Honestly, I just prepped more. First year, I froze on things like 'what did I watch' and 'what do I read'. This time I had a movie list and a pile of books next to me in case. But I had different interviewers both years so each interview was different. Year one, Eric & David went deep on my materials. Year two, Trey and George kept it casual and it was over in 15 minutes.
I would say just improve and be yourself. If they waitlisted you it's for a reason. Also, last year they didn't let anyone in off WL from my understanding. This year I expect there will be movement for sure.
Thank you for your congratulations.