Earlier quoted context omitted.
Have you considered saving up enough money to quit and give yourself 3-6 months to find a job you enjoy?
Somehow it seems wrong to be saving 6 month salary just to get into another job (even if you enjoy it). My Euro-biased perspective is for the job to be something that you don't actively hate doing. The fun stuff(hobbies, family, etc) can be done outside of that.
Learning to quit a job you hate and to save money are both vey useful skills on their own. In reality, it might just take a few weeks of intense effort to find a new job in a different field - but it's always good to have a buffer, especially if you want to re-skill to a completely different field.