To the OP, I don’t want to come across as a jerk, but asking for advice on undiscovered towns/areas so that you can move there is about the same as asking for someone to tell you a specific place to kill a big bull.
Also, anywhere within close proximity of a ski area or rivers that have trout in them are major draws for certain demographics and have been “discovered” for decades.
These days, even smaller ski areas around the west suffer from crowds trying to escape the experience of skiing at larger resorts. The other issue for small ski areas is that most of them are pretty boring due to limited terrain and marginal snow conditions / short seasons. Sure, you may have fun for day or two or a big storm may hit just right, but essentially there’s a reason most small ski areas stay small.
Lift service skiing is popular for a reason, but recently backcountry skiing has exploded due to what resort skiing has turned into. My advice would be to change your expectations about finding an “undiscovered” location because they really don’t exist.