My solution, adopted when I was in my mid-seventies, involved two steps:
1. I got rid of all removable lenses and their associated cameras. I now have only two cameras. My "small" camera is a Canon G5X, with built-in zoom lens with a moderate zoom range and very good image stabilization. My "big" camera is a Sony RX10-III with an excellent built-in zoom lens with a range of 24mm to 600mm (full-frame equivalent), and excellent image stabilization (I can spot a bird in a tree and zoom in and get good, clear shots hand-held.)
2. I gave away my Gitzo tripod to a friend who needed one, since I decided I didn't need to take any more long-exposure photos of waterfalls any more.
No more carrying a bag of heavy lenses to change, no more tripods to log. Just freedom to photograph whatever I see that interests me. I have never missed the individual lenses or tripods.
Of course, your mileage may vary.