Time for a change of mindset: Add galleries to your stable rather than the other way around.
In an issue of his Twice-Weekly Letter, Robert Genn responded to a frustrated artist whose format was being copied by his fellow artists in a co-op:
Keep supplying your work to the gallery, but don't hang out there. Look for other galleries, collectives and friends who may not be as likely to clone. Your success is your calling card.
Take control and put galleries in your stable, not you in theirs. Keep pursuing your private bliss. Your natural curiosity, creative flair and good work habits will take you to your next epiphany.
The impetus for the letter (the copycat in the gallery) isn't nearly as interesting to me as that one sentence.
It's a reminder that you have power over your career.
You may think that galleries, curators, and critics have the power. And they do. They have as much power as you give them.
You're in charge of your art career. It's the first of the 6 Principles of No-Excuse Self-Promotion.