Hi LECHUCK,
I think that what you are experiencing is something a lot of design workers experience. Most of the things you mention are universal for graphic designers as well as for 3d Artists. I would say that long hours for example are more dependent of the company you are working for then the stuff you do. It is absolutely not uncommon in the 3d World. But as you often have longer projects then working 2D you might have the possibility to arrange your work in a smarter way and therefor you might be able to influence it a bit. But the more efficient you are the more work will be put on your stack... so well it stays the same 🙂.
I am in a quite similar situation as you are, just on the 3d side. Doing this for 20 years I have the impression to have reached a border, that doesn't let me develop any further. of corse not artistically (there always is plenty of room in 3D) but concerning the projects and income. Over the years this border somehow didn't move with the inflation of lving costs. therefor it relatively gets less over the time. But you will still get paid quite a bit better then a regular graphics artist even thoug you will not get rich.
One thing, that I used to love about 3D but after such a long time starts to annoy me once in a while is, that it is 1. a huge area and you have to learn several jobs to master it ( sculpting, camerawork, lighting, directing, and so on) and 2. it developes so rapidly that you always have to learn new things. So you will not get bored that easily but on the other hand it will stay demanding for the rest of your career. And that also is true for a lot of everyday work there are not so many things where you can just switch of your brain.
All of this of corse is just my experience living as a freelancer in germany.
I wish you the best luck with your decission.
best regards
Jops