I'm sorry you've been going through so much. Taking care of a new baby is exhausting enough but to do it with a sick heart is even worse.
I have some friends that have had their EF improve over time with the right medications and life style changes. Their hearts will never go back to being perfect but they're doing so much better. One friend travels and works out at the gym, another friend locally is pretty young with CHF but she also travels and stays busy with her friends.
This is something that has be to managed by your cardiologist. If you're having problems with fluid retention, chest pain, etc., you and your cardiologist need to come up with a plan on how to manage all of this. Don't give up. Your life will be a bit different than what you expected but it can still have its fun times.
Sorry I have what they call post partum cardiomyopathy