Having kids is by far the most life constraining thing you can do. Don’t do it unless you want to be a parent! I have two kids and my life is unrecognizable from what it was before. I enjoy my new life but it is 85% dad, 15% old me.
I would recommend the general area of making sacrifices and servicing others in some form. I think that is a big part of the “spiritual” fulfillment of parenting. I used to be so much more self centered. But now I get up every day thinking how to make the lives of my kids and the world better, rather than “what would my lizard brain enjoy today “