One point not yet made: don;t beat yourself up over this. It’s extremely easy for a shop guy with a company patch on his coveralls to convince the average person to have things done that do not need to be done, and vene to do things that should not be done. Those that do so are experts at it.
I’ll bet money that I can put any 9 year old vehicle on a rack and convince anyone not knowledgable in vehicles that they need at least $2000 worth of work and $200 worth of “preventative maintenance” none of which is actually necessary. That number does not include anything I find that actually does need to be done.