Just getting through the day is not much to offer others. When you are in that state of mind you expect others to change that for you. That is not fair. So work on being a happier you. Rejoice in the memories, but think of her as a unique individual, like a first born, and the next born deserves a clean slate and appreciation of her own qualities.
Desperate people are out there making big mistakes every day.
Don't be one of them. Moving on, of course. Just make new friends first and let love come when the time is right. Life is a gift. We are here to learn and grow and loss is a lesson we will all have to experience.