You can start however you want.

You can be a Xeno-Knight that wears an exo-skeleton battle suit/mech of your order and going out to a space crusade

You can be an Elf, the most enhanced race with light travel as they come in many different clans like High-Elves, Elves, Dark Elves, etc.

You can be an Dwarf, the masters of AI creation and mechanical engineering

You be ancient races like Angels and Demons. Instead of seen as holy figures, they're oldest species and once were a single race until splitting up due to a civil war of who should be ruler of the forgotten Afterlife Project (There is no afterlife, so these beings tried creating a afterlife for all species)

You can be a dragon, the only race that can breathe and fly in naked space without support. They can go into lesser forms called "Dragonborns" if you wanna be a humanoid dragon.

You can be an Orc, they have the most destructive weapons in the universe as their basic weapons can destroy moons.

If you want to be a sorcerer, then be a Void-Witch/Void-Lock. A person who learns enhanced science called "Arcane," but you must study your spells and write it along your skin as commonly many people died just because their equations were wrong.

Don't be afraid to add other mythical creatures to this setting like vampires, cyclops, werewolves, etc, or your own race.