My first piece of advice after such a major break up is that you’re probably going to need to move to a different city. Focus on choosing somewhere that excites you, where you think there will be something new for you. And when you get there, advice from others applies. Need to work damn hard at meeting people. Do three big things. Maybe a social group where you just consume something, like film or books. A social group where you make something, like photography etc. And then maybe a course or similar. If you want a good social life, I’d say three different social groups is necessary. Some will shut down or end. Replace them.