Getting 20 interviews is an accomplishment.
I have a 100% sucess record on getting the job offer once I get an interview l, but getting the interview is the hard part for me.
The thing is, I'm also terrible at coaching others for interviews because I don't know exactly what I'm doing right or wrong since I effectively have no negative feedback.
At this point I think it's mostly my confidence that carries me because I basically assume I'm getting the offer. I ask a bunch of questions about the company, working environment, etc and essentially make them pitch the job to me instead of me pitching myself as an employee. I'm also generally comfortable enough due to my past success to mostly be myself, and I think any time you can make the interviewer laugh it's a good sign.