Replying to Boots (I know)

I'm looking to pick up a new pair of boots for this season. Right now I have Dalbello Aerro 65s (pretty much the cheapest I could've bought a few years ago), and I'm finally starting to regret it. Last season my feet hurt too much and were cold too often. I definitely recognize that the best way to buy boots is at a pro fitter, but there aren't any shops within a couple hours of me with fitters whom I'd trust.

What's the best route to take? I wear 27.5s right now, but they're packed down pretty far at this point and are starting to be too big. Are custom liners worth it? Any advice would be appreciated.