After having "automatic" friends, making real friends takes a bit of work. It's worth the effort because they will be real friends. I'm trying to remember when I left 20 years ago. (Yikes! That long?!) I did join a church (Unitarian Universalist) and have a couple of close friends from that. I like to sing, joined an informal group. Struck up conversations with neighbors, invited them over for coffee. I made friends with coworkers. I realized that what I used to count as friends were high in number and short on committment.
It takes time Oompa but you'll get there one friend at a time!