Save your money. Your bike is at the point where you are better off just maintaining what you have and put the money you would spend otherwise in a piggy bank. A lot has changed since 2013, including Boost spacing, so save your money on any upgrades you might do otherwise, put that towards a new bike, and sell your old bike when you’re ready.
I’m also in the midwest and been riding the same bike since 2011 (Lenz Sport Leviathan), also with a Reba (RLT Ti 120 and 20mm thru-axle). There’s nothing wrong with the Reba, especially on a Stumpjumper of that age.