Very gently op, the greatest lesson of parenting is that our dc are not ourselves. We need to find, nurture and heal our inner child and that is the work of a life time.
Your parenting journey with your biological dd is going to be difficult because she will not share your trauma, and that will be a painful separation in your psyche, regardless that you would wish nothing but good things for her.
can I ask you (and you have no obligation to answer a stranger) why you have decided to have no more dc? That in itself is another decision filled with pain, even when it’s taken willingly.
We have to take time to feel our wounds. The greatest mistake is to rush from one decision to the next. And we approach therapy as a version of medicine - take the pill, apply the bandage and the wound will heal. Or worse, chop off the bad bit.
Our psychic wounds don’t heal - we learn, if we are given the chance, to carry all of ourselves in balance. The hurts are as important as the joys and hopes.
I think the child you need to find, and love, is yourself. You have time to find her, and to raise another little girl who holds so much of your heritage within her, and still have time to reach out and touch the wider world with kindness.
Try and find the courage to slow down, to be still, to press pause on this quest. I’m guessing just the thought of postponing for a few years is incredibly hard - that’s because your real work is still waiting.