If I can recommend an idea, I'll say for add a new antagonist to complement "Otis".
Otis is the main antagonist, super overpower, and he will be a challenge for our amazing Sonya. But he can not compete with her at corporative side.
I think that a new character that can be a challenge for Sonya can add the cards at your hands for a more variable narrative.
Honestly, Sonya is one of the best FMCs ever and "Broker" is super high when we compare to others novel in scribble hub.