This is my situation! And I can’t seem to find anywhere that feels quite right to move to. Budget is £900k and I currently live in Hackney, London.
Have been in this neighbourhood for more than 15 years and it suits us well for lots of reasons - great community, like-minded people, excellent schools.
But we want something bigger and a tiny bit safer and good for teens (although dc is only early primary now).
The cheaper options of London that our friends have gone to (Walthamstow, Leytonstone, Finsbury Park etc) aren’t quite right.
We considered “naice” areas of north london (crouch end etc) and living in a smaller space or extending our mortgage and spending more, but they seem “naice” and dull at the same time 
(sorry!).
I have no idea where to go! I want to live somewhere a bit less urban, but with a great community. I love a place with a bit of charm about it, and independent shops, etc. But where is that?! Help!
We’re also not tied to London. We work here, but have portable jobs.