Ada Palmer's terra ignota. It takes 'the past is another country' and really sends it forward. The world she draws is fundamentally different from our own, as ours is from medieval France. Absolutely fascinating books, with their own set of Utopians trying to make a better world for the future...
And I'm the vibey solar punk direction, Becky Chambers' 'Monk and Robot' is a fascinating pair of novellas about humanity reestablish ing contact with robots after they decided to just leave 250ish years previously. It is very much a book about a Good Future, where people still have people sized problems.