Somewhere along the way, many of us absorbed the idea that coping alone is the goal. It is not, and it never was. For almost all of human history, new parents were surrounded and supported. Asking for help is not a fall from grace. It is the oldest plan there is.
Support is not a luxury layered on top of recovery. It is part of it. Rest, food, company and a free pair of hands all directly affect how you heal and how you feel. Trying to do everything solo does not make you a better parent. It just makes you a more depleted one.
Letting people in is not giving up. It is how this was always meant to work.