Hi)
Could you make the brief more specific? Right now, it feels more like a dream description than a technical specification.
Here's what it looks like from a designer's perspective:
"We want:

logo;
brand book;
series of illustrations;
Substack design;
Spotify design;
Instagram design;
Facebook design;
contemporary art concept;
psychotherapy;
quantum physics;
divorce; breathing exercises;
Anna Kinkade;
the Universe;
and for all of this to look good on a 40x40 pixel avatar."
Just look at the logos on the platforms you described, and try to realistically imagine what you've described here instead...