How about meetup groups or joining like-minded people / people who like the same activities as you or who share common interests? Volunteering? Support peer groups?

PS: If you were to try therapy again, I would choose a different therapist. First her initial advice to go to that reunion was, imo, a poor one. Secondly, if she will only tell you something like: use a manual or 'go find yourself' - then she is clearly not the therapist for you. There are different 'brands' of therapy and I would explore what these have to offer. Not all therapy techniques are the same.