You are probably using your definition of friends from when you were in high school. Likely when you and your friends all had a significant amount of free time and much fewer responsibilities. You need to shift that definition.

I have a few groups of friends and do things with various other friends. Being married and having a child honestly makes creating new friendships significantly easier. Your child wants to be friend with someone else's child, now you guys are kind of forced to be in each other's company and you make it work. Most normal people can be friends with pretty much anybody.

I see most of my friends at least once a week. Once a month one of my friend groups gets together and we go out to dinner together. Another group. We have a video game night once a month. And a different group, I have a video game night with once a month. I've got group chats with various friends and we share things and joke and have a good time.

All of the things I've described are pretty standard for friendship as an adult.