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Love that you’re getting genuine 1-bike-for-everything use out of it.
If you’re upgrading you probably won’t want lower than 105 level so that gives you the cables hidden under the bar tape for a more modern look. IME 10 and 11 speed 105 shifts perfectly, it’s remarkable how good it is. It all depends on good maintenance of course. I think 34x32 is probably low enough even for touring in mountains given that you’re a regular rider but if not then you might need to use a mtb cassette and mech which will be fine compatability-wise as long as you stick with the same number of speeds from the same manufacturer.
Brake compatibility shouldn’t be an issue either.
105 10 speed mech but think can only go to a 11-32 cassette as short or medium cage. Currently on a 11-28 which with a 34 small ring up front if fully loaded and hilly touring won't be great