Well let's see.
I enjoyed my kids as little people and watched and enjoyed the milestones. I also liked when they were more independent and could do somethings for themselves like getting dressed and putting on shoes and coats.
Each phase in life is different and you embrace the changes and know that you did your best to be there for them when they needed you. Take lots of pictures and put them in a book and write a journal of your thoughts and give it to them on their wedding day or whatever in the future.
I didn't have the school down the street very often as we were a military family and moved around a bit. Our last overseas assignment had the schools in the housing area and all the kids walked to school that lived on base the others came by bus.
As for your career, look at it thoroughly and find something that you like about it and focus on that. Or find something that you really want to do and do it. So that by the time the kids are out of school you will have a career or a niche and enjoy life. I have always worked because that is me and that helped the kids see that mom is more than just mom. I also did this so that I would not have the "empty nest" syndrome of trying to find myself after the kids were gone.
Suggest you find a hobby or take a class in something you like or want to try. Good luck to you.
the other S.
PS I felt so bad one day when my daughter in six grade took a class trip for a week to Austria and I thought to myself "Oh my baby is growing up!". It only lasted until the bus pulled away and then I went on with my life and so will you. It is part of the life cycle of raising children.