Wonderful, scenic places without other tourists. In Italy. This is a tall order.
In fact, these do exist. But finding them, and getting to them when they fit that description...that requires a fair amount of effort. You need to invest time in learning about all sorts of things: what you like (and don’t), where to go, where others go, when to go, how to get there, etc, etc etc. That requires time, effort, and the willingness (even some enthusiasm) for “doing the work” of research and planning.
if you don’t make the slightest effort, then you get to squeeze in, shoulder-to-shoulder with thousands of strangers who also didn’t make the slightest effort to learn what they needed to know. You can, to some degree, “buy” your way out of doing the work, by purchasing an organized tour. Of course, that tends to put you right in the thick of other tourists, who have also bought a tour, and all those tours usually go to the same places (and usually put you there at the same time) because it makes logistical sense (a few specialty tour, like the Rick Steves tours, will try to mitigate the crowding to some extent, but all tours concentrate tourists, by definition). If you really want to have places to yourself, you generally can’t go to famous places.
Most of all, you need to invest your time. The more effort you put in, the better the trip you will have. Or you can rely on luck and the kindness of strangers. Personally, for most trips I invest a lot of time in research and planning, and find that as enjoyable as the actual trip - the planning is part of the trip experience.
Bottom line: OP needs to roll up their sleeves and make an effort. Start with a good guide book, watch the videos, take notes, google click click click, work up a plan, refine it, rinse and repeat.