You might consider thinking of the "big idea" behind your setting which can be used to describe it in an elevator pitch. In other words, emphasise what's unique or different about your idea of CE 2100 compared to others.
1) it's not a disutopia
2) it's not post apocalyptic or apocalyptic
There is no looming disaster. No runaway greenhouse effect, the ecosystem is not collapsing, the Earth is not becoming uninhabitable forcing people to move into space.
3) no Megacorps are taking over.
4) it is not a dark future or a disguised critique on contemporary society.
I haven't decided what wars would take place, the timeline consists of technological advancements and migrations, though I imagine there will be frictions between the various powers, there may be proxy wars, perhaps some colonial term wars, perhaps some settlements want independence from their colonizers, or perhaps some colonies are run by corporations and some people in them don't like corporate rule.
There may be some AI in this setting, if so it isn't a common thing, a human level AI is a disrupter, the AI comes as late as possibly it can be, it is an experimental prototype if it exists at all.
It is kind of a blank slate generic future based on what I think is most likely to happen over the next 80 years, we can add some other stuff, like alien artifacts perhaps. And there is the Starship Prometheus, it has stayed in contact with the Solar System over its entire journey, it is entering a star system with three stars and three habitable planets, one of those planets is most promising and they named it Prometheus, a size 7 planet but denser that Earth, has about 1 Earth gravity on, its surface, 50% water coverage, and has huge deserts, and a dense atmosphere, about 10% oxygen but since it has 2 atmosphere of air pressure at its surface it is breathable by humans. The climate is dry compared to Earth, the oceans are saltier than Earth's oceans, and the metal content in the planet's crust is higher, and their are ruins and alien artifacts, the first artifacts by the Ancients in fact, the crew is trying to decipher the language, the arid environment of the deep deserts have preserved a lot of artifacts and they are estimated to be 200,000 years old.