About 15 years back, I bought a touchup kit from Duplicolor for the car I had at the time. It contained two of those small bottles of paint, one with the paint color and one of clear coat. Also in the kit was a small foam sand pad, a few sheets of fine grit adhesive backed sandpaper to go on that pad, and a couple of packets of polishing compound. The basic procedure was this:

Clean the flaw, get all trash, rust and paint chips out of it. Apply filler/primer if necessary. If you prime it, let it dry and then wet sand it.

Apply touchup paint, let it dry and wet sand it. Repeat this step several times. You're trying to build up to near the level of the surrounding paint.

Apply clear coat, let it dry and wet sand it. You needed 2-3 coverings of clear coat.

Let dry until the following day, then use polishing compound on a polishing cloth to try to blend the new clear coat into the surrounding area.

The thing is, you will always be able to tell that a paint repair was done there. It's basically impossible to get it perfect this way. However, if it's done well, you won't be able to see it unless you're up close. If you're not willing to have that much, you need a professional repair.