It’s good that you could book the hotel. And your plan seems good, too:Tokyo + other places.
There are many YouTube videos about Japan like this:
And the following is one of the best advices among them, from which you can learn a lot,
although you have already studied many things about Japan:
https://www.youtube.com/@japanguide/featured
We think Kyushu island((southern Japan) is very interesting. There are a lot of spas and tourist attractions.
Hokkaido island(northern Japan) is also attractive.
You can also study:
Japan tourist attractions:
https://is.gd/eCnzCs
Tokyo tourist attractions:
https://is.gd/MA7IVC
-spas in Tokyo
-baseball games
-mountain climbing at Takao
-sumo (wrestling) which you have already seen
-Tokyo DisneyLand
Kenya