Evaluate your backpack. If your pack is low quality or old an worn out, or doesn’t fit you, nothing else will help you. A quality pack that fits you will seemingly melt some of that weight off. I live in the mountains and use two different mindshift packs depending on time of year and where I’m going.
You have to be in shape. If you don’t regularly hike or hike with a pack then you suffer or could injure yourself. I’m 68 but still work for living outside. My jobs are physical, but, I snowshoe or skin in the winter. I teleski. In the spring I start with some short hikes and work into longer ones.
Water: It seems our society has been taught they need to be drinking water constantly all day long. Yes humans need water but if your loading three times what you need, that’s a lot of extra weight in that pack. In my environment just two 32 oz Nalgene bottles is what I take for long hikes above treeline. One is electrolytes. In the desert that amount may double.
I used to take as much gear as you. I found that I probably missed a lot of shots because I was always screwing around with the gear. Now, each hike is more specific. If I’m after mountain goats up high then it might be the D500 with 200-500mm and that’s it. If it’s landscape/flowers then a body with 28 and 40 mm lenses. If it’s a let’s see what happens trip then I take a 18-400 lens with my D500. A side benefit is I’m learning to be more creative with what I take because I don’t have every lens I own with me.
Good luck with whatever you do.
Those photos you consider irrelevant now will be historical in 20, 30, 40 etc years. They will be part of a story about those places and times.