I was trying to think about what I have done over the years?
My most important adaptation was to put a shoe length edge of running shoe insert under my Sorbothane inserts to stop so much edge wear on the soles of my hiking boots and to correct my gait to neutral. That's worked really well, my boots now wear evenly and I can walk much further in comfort.
I also sewed (correction, my wife's friend sewed) a piece of 2" soft cloth around the inner tops of my Rab gaiters, I tend to wear my gaiters under my walking trousers and without the soft cloth, my skin became sore.
The same lady also fitted weighted hems around my Vaude poncho, my rain skirt and around the hem of my waterproof long coat, to stop the wind blowing the items out of place.
I also got a sailmaker to fit four 2" x 4" see-through patches 2" around and above the bottom hem of my outer tent cover. After being 'got at' but 5 large domesticated pigs in 2015 I decided I'd like to not only hear what is going on outside my tent I like to see as well as an aid to decision making. I can't see clearly what's outside but by just opening my eyes I can at least judge by the physical outline if its the noise is coming from two legs or four and to make an instant judgement as to how many are out there.
It wasn't an adaptation as such but I did change from using ordinary grip walking poles to Pacerpoles, for me the Pacerpole grips are far better and more comfortable to us.