How have you made your friends?
If you found yourself living alone in a new town where you don't know a soul, what would you do to make friends? Imagine you make a very modest living working online. Imagine further that covid restrictions are not a thing.
(Edit: For the avoidance of doubt, I am not in this situation. I have lived in London for the best part of 30 years. I have very few friends - it's a long story - but I do know how to make them here when times are good all round. However, I am always on the lookout for new ideas.
The 'big three' sources of friends in London, and I suspect most places, are: school/university friends; current and former flatmates/room-mates; and former work colleagues. The scenario outlined above explicitly excludes these.)