Ignore everyone and make sure you get to sit on / have a ride and pick what feels best rather than buy blind.
Or ignore that and buy blind 😆 . I have on practically every bike i’ve owned. Latest being a Rocket Max 29 (also perfect for your needs as a complete bike).
As you can see from the many suggestions, there are oodles of bikes that more than capable for the riding you do/aspire to as the market is swamped with great bikes. Frame swapping will likely be an utter pain and not something i’d do personally as my mountain bike ‘standards’ knowledge is limited. But if that’s your thing i can’t help with frame choice i’m afraid as i’ve not ridden any on your list but will say if your current wheels/brakes etc are ok now, they’ll be ok after. You admit you aren’t finding the limits of 140mm brakes so i conclude you aren’t really giving your bike too hard a time. Wheels, if looked after, will be fine too.
Maybe get some new forks first and stick them on your current bike and see how you get on? Bigger rotors too if needed. Burly it up gradually, while saving for and deciding which new frame.