Choosing to wean, but sad to see supply dropping

EP is a freaking rollercoaster. In the process of slowly weaning (16 weeks pp, currently at 4 ppd), and while I'm weaning my choice to improve my mental health and to spend more time with my baby once I start work again soon, it's still really freaking hard and emotional. My supply is tanking after going from 5 to 4, and it's making me feel bad, like I feel I'm not enough. And I'm already feeling like once I stop pumping fully, I will have lost a part of who I am (or at least of who I have been for the last 16 weeks and a big part of what has defined me so far as a mother). While I want to be done, I'm... almost scared to be done.