Interview Prep for Desired Job

So I've been trying to get a state job for over 5 years now, and in the last year I've landed interviews for 3 different postions but no job offers.

I recently landed another interview, scheduled next week, for a position that was reposted and that I had already interviewed for before. I think it's being treated as a second interview for the position because the panel I'm interviewing with are higher level employees than the first interview, but I digress.

The point of my post is, what do you guys do to land a job offer? How do you prepare for interviews?

So far what I do is:

I make sure the interview is scheduled on a day and time when the interviewer is most likely to be in a good mood.

If I'm provided the names of the interviewers, I look them up online so that I know what they look like and get a feel for who they are so they feel more familiar to me.

I break down the job posting by posing their preferred qualifications as questions that I answer, and studying the topics they expect me to know about.

I ordered a nice pant suit that I'm going to get tailored once it arrives (hopefully today).

So yeah, what else should I focus on?

Edit: I'm surprised that I'm not getting any feedback. I want to take it as no news is good news but I'm afraid the silence is more malicious rather than good. I'm probably just feeling anxious about the interview. Does anyone have any tips on how to relieve interview anxiety?