A lot of weight reduction is about having confidence in your own abilities to navigate, ride, fix and cope with adverse conditions. You only get this from experience so my advice would be to do a weekend shakedown tour, leave out the excess then try a week or so and see what works for you.
Metalwork is heavy so think about how you can minimise your toolkit yet still fix your way out of trouble.
Footwear is heavy and bulky and it is always a major issue, do you need clipless cycling pedals, hiking boots, trail shoes.
You have heard about how electronics can stack up in your bag but paperwork can run riot. You collect maps, guidebooks, tourist leaflets, tickets etc at an alarming rate. Consider an archiving policy such as: Throw Away or Send Home