Regrets is the right question. Not sure I’d sell it because I wanted to get a car for a fourth driver… I’d just put classic insurance on it or pull the tags and park it for a bit… then buy the kids a Corolla or civic or cobalt or something similar, assuming they’re not into cars and don’t really have a specific model they fancy.
Its a clean car, you have its history. That’s worth something. Sure there are probably other clean ones out there, but not yours. Not one you’ve had since 18k.
I get it that priorities change. Sentimental value can play into it too though. And the challenge of replacing it.
I suspect that you might regret it, or at least get sentimental and say “why did I ever sell that?“ At some point… how bad it would bother you, and if you’d get an itch for something like that, especially given how much faster even stock basic cars are compared to a few years ago might be the bigger question…