I know interviews can be awful, but you sound very confident that you know your job well and that you could do any position. Take that confidence into the interview with you.

I also remember that the people that are interviewing you are just people, yes, they may have some power at that point in time, but there's no reason you can't make an interview more into a conversation that you feel comfortable with. What helps me with this is that my dad was an HR manager, so I knew him from a personal side and he is just a person. Outside of their work roles, everyone is just a normal person with a family, etc. so don't build them up too much!

Anyway, remain confident - you know the work and you know the role, so go in there with that knowledge!