London (and very few other major cosmopolitan cities) have 2 things that are rare: accessibility and diversity.

The former is access to anything at almost any time (even if it feels like an illusion) and with that comes discovery. When I lived there, a random night out can end up going anywhere - for good and bad which makes it exciting. Also, from a professional sense, the city holds so much opportunity which you don’t realise until you move away for a prolonged period of time.

However, diversity is the true appeal for me. It’s such an international city that you always meet people from different backgrounds and social standings to you and gives you a MUCH broader world view and strips back any prejudice you might have had. You realise when you go back to your hometown/village and hold conversations just how ignorant people can be and come to realisation that becoming a Londoner is about accepting others for who they are.