Do you have PTO? Take all of it, as much as you can be allowed, and just treat that time as if you've already quit your job, and see how it feels. Ask yourself

Do you have PTO? Take all of it, as much as you can be allowed, and just treat that time as if you've already quit your job, and see how it feels. Ask yourself various questions. Are you able to work on what you want? How are you feeling day to day? Are you able to sustain your self-discipline to work on your side projects? This is the big thing that I've found when I felt like quitting; the productivity doesn't come immediately, you must train it.