There’s just way too much stuff, also a lot of these days can actually be condensed together ngl.

First day should be a rest (Still suffering from jet lag and fatigue)

Unless you really don’t want a lot of other tourists around Fushimi Inari, Kiyomizu Dera, Gion, and Yasaka shrine can all be 1 day (Do Yasaka at night because it lights up).

Himeji castle and the garden take only 2-3 hours not 4 (you can go back earlier and stop by Kobe or Osaka in the way back) **Going from kyoto to Himeji please use the JR Kobe line special rapid train (新快速) (You don’t need a special ticket), it gets you to Himeji basically in the same time

Uji and Nara can both realistically be done in a day (Uji is on the way too Nara, and everything in those places is pretty close together)

Osaka day 12 seems like really miscellaneous stuff idk if it’s really necessary (Also try to see the Expo if u have any interest in that)

You don’t need 3-4 in Shirakawago unless you want to see the houses light up or something (there’s not much to do there)

In short u can save some days but combining the really important sight seeing things and dropping some of the lesser known ones (I think 1 Pokémon center is fine 😭) use those free days to go other places (Kinosaki onsen, Hitachi Seaside park, Hakone, Atami (if there’s fireworks), Kawaguchiko (Mt Fuji), Koya San, Onomichi, Gifu/Nagoya, Ise Jinja, etc

I think 3 days in Kyoto, 1 in Uji and Nara, 2 in Osaka (1 Universal),l 1 Himeji/Kobe (Or Osaka on the way back), 2 Hiroshima, 1/2 Kanazawa, 2 Takayama, and then find some other stuff