Silverline
“Release that Witch” was pretty good about that. It’s one of the most popular books so it’s easy to find. You may have already read it as well. I can also only speak to the first 20 or so chapters. I didn’t read all of it or check if there are over 300 chapters. I’m pretty sure it’s over that...
The premise is an engineer being reincarnated in another world with medieval technology and magic. He uses magic to advance technology to modern times. The magic kind of “just happens” but the steam punk tech is very well explained (so far). As a real life engineer, I found no problems with the stories logic (provided you accept that the witches just have magic).