Go to concerts and chat with people between sets/afterwards. Pub quizzes are good too, see if a team is a member short and if you can join. Get into pen & paper

Go to concerts and chat with people between sets/afterwards. Pub quizzes are good too, see if a team is a member short and if you can join. Get into pen & paper gaming, your local trad games store probably arranges open nights for new people. Anywhere there's a shared interest, friendships happen.