I think you've done well with the concept! Solid history without being too ornate, lots of open room for development and questions answered, and sounds like you've already got ideas about how to highlight with mechanics.

The only piece of advice I would give is, in addition to thinking about leaving hooks open for the DM to work into the story, also consider the other direction: how is your character going to be moved, compelled, and changed by the broad strokes of the adventure they are going to get into and the companions they are going to be adventuring with? How can this character help set up other characters to do "their thing"? I've found the games I've played in to only be improved by having those dialogues with the DM and other players up front