This is what I worry about too. You can't sell everything and right now we are in a temporary place, storage is a really big problem. But if you have a place honestly just continue doing it. There is always a buyer somewhere, just have to find your right audience. But I do agree, digital is a lot cheaper and you can print them anyways if you want (or redraw on canvas).
Ohh I heard about that before too but Photoshop really is just something that I gotten used to since I also use it in photography. I think Clip also have 3d? That would be nice for you to explore as well. It is indeed very overwhelming, same feeling I had when I first tried it haha probably why I didn't really like using it.
In 7+ years I only sold 5 normal pieces and 1 nft. I wanted to sell this piece to local pizza place:

But when I came in I was embarrassed to ask money for it so I just gifted it away. I guess I am better artist than I am a seller.😛
Yes, Clip studio paint has 3D figures and poses. I have done a few pieces with 3D already(1, 2,3...)