there was that post recently about Creative Throughlines, and more recently i've learned about the way Fromsoft and many(?) other Japanese artists and creators will dedicate themselves to a main concept that underpins their works.
For my own part, i think i do have two themes that i keep coming back to:
The boundless infinity of the universe, full of awe and terror,
and
The feeling of freedom.
And i think right now i'm in mind of the second one.