My way out is two-fold - it is still work in progress, so take it as an attempt rather than a solution:
1. Stay at the soul-sucking job a bit to gain cash and invest in assets that generate passive income
2. Find a time slot in your day or week that is absolutely sacred and do what you consider creative and fulfilling. That you're able to allocate only a tiny fraction of a day to creatively fulfilling work will hurt. But I'm hoping slowly you identify yourself more with this fraction than what you do to for the 8 hours.
Been trying to do this for a little under a year now and there are some good days and some bad days, but I think it keeps me sane. Will need 5ish years to know whether it's really working.
An interface specifies a contract that its users can depend on. Having one saves me from reading implementations of dependencies when reading a class.