You seem to be in a situation where your current friends will be less available, leaving you more room for additional friends!
Find or continue a hobby (on your own or with your partner), meet some people, make some new friends.
Also, don't abandon your current friends. Keep talking to them, remembering their birthdays, etc. Keep trying to do stuff together, but just respect that their schedule will be heavily restricted and do your best to work with that.
Your parent friends can focus so much on how the kids are doing, that having someone who cares about how they are doing is also extremely valuable; be that friend!
...or if it became powerful enough to start pulling sharks out of the water and carrying them inland...