Tips on drying up breasts?

My LO has multiple food allergies getting passed through my breastmilk and I’ve been on an elimination diet for the last 3 months. My supply has dropped to where she’s 1/2 breastmilk 1/2 formula, but still showing signs of an allergy/intolerance.

Exclusively pumping / restricted eating has taken a toll on my mental health and going back to work has hindered my pumping schedule.

All that being said, please don’t try to convince me “breast is best” or give me tips to regain my supply... I’m already feeling so much mom guilt and I just want her to be as comfortable as she can be on hypoallergenic formula.

Thanks x