Literally just start from this year and read from there. When and how does the Ukraine war end? When and how does the Palestinian genocide end? Does Netanyahu survive long enough to make it to The Hague?
Other than the stuff already mentioned I'd try to find out how we mitigate climate catastrophe or at least where the enclave of civilization is in which the historian wrote the book
I wouldn't be surprised if there's a world war between great powers in the next 100 years. I also wouldn't be surprised if there isn't. I don't know and it's a question of importance.
Early First Cold War (Korean War, Suez Crisis, Cuban Missile Crisis, Six Day War and Arab nationalist movements)
Precursors of the Eurasian Common Defense Pact, beginning with Syria circa 2013
The Undeniable Year, what they are calling 2035 because of the unprecedentedly severe droughts and storms that knocked out lots of oil infrastructure and set 40 million climate refugees on the move, and the draconian emergency measures that Western governments took in the wake of this