Struggling with loneliness after divorce

Got the finalized papers last week and it's hitting different than I expected. The house feels huge and quiet and I'm realizing a lot of my social circle was tied to her friends or family stuff. I'm 42, out of practice with making friends, and some days I just feel completely alone even when I'm around people. Started going to therapy last month which helps. Anyone been through this and found ways to rebuild their social life?