I've been a developer for about 15 years.

Nothing you've said makes me feel like you should quit.
Wanting more money is a perfectly respectable reason to want to quit, and if you think it would make you happier, go for it. Get paid.

It's not better to be an engineer or anything. No one will mind or hold it against you if you come back and say that you were a jr dev, took a position as otherntech job, but it wasn't for you so now your back with a new perspective and set of experiences.

Programming was once my passion. I got a lot of joy from it. I still do, and I would say that it still is a passion. But I've stopped really doing side projects unless it's particularly interesting. There's more to life than career development, and that's okay.

Without seeing your code, I can't know how good you actually are. Like most people, you're probably average. Don't beat yourself up over not knowing algorithms. No one knows those, they know the keywords and how to describe a problem and then how to pick the right one or tweak something to make it right.

The road from jr to senior is also less about technical proficiency than you would expect.
Technical competency is a must, but you'll go further as a competent technical leader who can breakdown work, describe it, and help their teammates than as a lone high performer.