Unfortunately there is none of that left here in SE Wisconsin or NE Illinois. There is about 50' on each side of me to the neighbor and about 200' to the front and back of me. Have sisters in Montana and sorry but that is too isolated for me. Before they retired and moved into town my sister told me it was 4mi. from the house to the road and the mail box.
I'm not advocating you move, because yeah, that isn't an option for many people. I'm just saying I find shooting alone in the woods better for many reason. But you are correct about SE Wisconsin, there isn't really much public green space left where shooting could happen. It's all privately, city, or state owned. I spent the first 19 years of my life there. One needs to look far to the north for open public land.
For folks who think my picture indicates isolation, please understand that there are degrees of isolation that fall in between Montana middle of nowhere isolation, and a big city. I live in a small town and my modest little home is sitting on three city lots. I have 45 or so mature trees on my little half acre, and a river running through it. Deer, rabbits, birds, skunks, and coyotes can regularly be seen from my bedroom window and typically I have 4-12 deer bedding down in my back yard all winter. The animals are so used to people here that I can literally walk within 5 feet of rabbits and they just lay in my lawn. Deer will usually tolerate me getting within 15 feet, and don't even bother standing up when I'm more than 25 feet away.
My town is surrounded by National Forest and the location pictured is a 15 minute drive from my house. I walk there because it is behind a closed gate and I don't see anyone out there, but my actual shooting spot looks very similar and is even closer.
There is a hospital in my town should I need one, and there is a larger city with almost all the amenities and medical professionals one could ever want just a 50 minute drive away.
My point is this, everyone needs to do what they want and need to get by, and I'm not trying to lecture anyone about where they should or shouldn't live, or shoot. It's not my business. But good places that strike up a nice balance between civilization and something a little more in touch with nature do in fact exist if you look for them. The only down side to the size of the town I live in is the lack of eligible single women in my location. Otherwise, it's pretty good. If you want to escape, there are places where it's doable without living in a county of 10 people, where you are more likely to see a bear than your neighbors.
Living in isolated places is for young or very rich
If you do some actual looking, you'll find this is not true. I live in a relatively isolated, low population place. I'm middle aged and not rich in any sense of the word.
If one shot themselves seriously in one of them picturesque places they could bleed to death.
Yes that's true, but that's why we have the 4 safety rules. Given what I've seen at public ranges, I'm a lot more concerned about someone else shooting me by accident than me shooting myself. But do what you're comfortable with. None of my business.