$7000 paint job

I painted my car this summer lots of orange peel now I have to try to understand how to fix that.
I have been playing with these cars for 30 years and this was first attempt at painting just couldn't find a painter who was less than 5k at best just to paint.
My question is what grit paper to start with and finish with.
Single stage acrylic paint was used thanks for any advice.

acrylic emamel and urethane will always have orange peel to some degree. been 10 years since I was at mopar nats, but the big dog judging there, those mega bucks resto cars,.... the rersto shop duplicated the look of the car as it left the factory right down to the orange peel, no BC/CC !

I will let an expert advise if you can wet sand/ buff and do any good. some may recommend a clear over the enamel???????

I congradulate you for getting paint on your car. everything is a learning process and m istakes can always be corrected/ improved upon.???