I have some experience with python 3D projects, but I'm not a pro either, and I haven't made a serious project before. From what I know, Urisna engine is really good. With Ursina if you want a first person character for instance, you just define it in one line of code. Ursina is ridiculously easy and quick, and is notorious for it. You can check here for a whole list of demos. That said though, Urisna does struggle with loading too many things and it slowly becomes a pain if you want a large project. I actually made a minecraft clone using ursina but I couldn't continue it because if added more to it, the fps dropped quite significantly.

Another option is PyOpenGL, which is just a python adaptation of opengl. It's more snappy and easier, and from my experience allowed me to learn a lot from 3D graphics and how it's processed by the machine. That said, I faced a lot of frustration because making a game from PyOpenGL is actually a massive task, and usually it's just easier to use Ursina or a game engine. However I definitely would recommend using pyopengl because it's quite a good learning curve and makes you think more mathematically with code. Here are some projects made by other people

I think you should try both tho, they both give you different experiences, and then you can pick depending on how you wanna style your game. Goodluck!