You could check out this stickied thread:
Sci-Fi Recommendations - for the unenlightened
The classic dystopias are Huxley's
Brave New World and Orwell's
1984 but there are a million more, such as Pohl & Kornbluth's
The Space Merchants. For utopias, there's everything from Bacon's
The New Atlantis to Banks' Culture novels with much between, such as Clarke's
The Deep Range. Dunno about conspiracy and almost every SF work of note would have to have technological features. For specifically biological ones, Le Guin's
Left Hand of Darkness is a major one and trends into the "sociopolitical themes" where her
The Dispossessed is also central. Heinlein's
Starship Troopers is also a major work of an alternate sociopolitical structure. As far as metaphysics, I don't know what you specifically mean by the term and it wouldn't generally fit in SF, but Rudy Rucker's cosmic mathematics might touch on it. For epic scale, there's always the space operas both new and old, from Campbell, E Hamilton, Smith, and Williamson on to Asher, Banks, Baxter, PF Hamilton, Reynolds, etc. My favorite epic scale work is Asimov's
The Foundation Trilogy and the whole mega-series around it.
Those are just a handful of random suggestions as a start. And welcome to the Chrons.