If you moved back to your home town today, what would you do for a living? Do that in London, or something related to it.
As for the ⅔ pay cut, aren't you spending a good bit of that now on excessive London costs? Plus the intangibles of feeling like shit?
Finally, there must be someone who will pay you remotely (even if "remote" is just WFH in the City) for your skills, or for your fundamental abilities that your skills are built on. For example, an advanced engineering firm that uses statistical quality control, informed by ML.
As for the ⅔ pay cut, aren't you spending a good bit of that now on excessive London costs? Plus the intangibles of feeling like shit?
Finally, there must be someone who will pay you remotely (even if "remote" is just WFH in the City) for your skills, or for your fundamental abilities that your skills are built on. For example, an advanced engineering firm that uses statistical quality control, informed by ML.