Traveling fatigue

I'm in the middle of my traveling, I'm doing Tokyo only and already visited 95% of the attractions. Planned a few day trips for the following days, but I reached a point where I do the things just because I have to.

These days of bad weather are also putting me in a bad mood and it surely does not help. today all I wanted to do was stay in bed at my hotel.

How do you deal with the mental fatigue of traveling? This is my first long trip. I want to enjoy this trip for the remaining days to my best capacities.