I'm in a similar position. I think one of the challenges is that you can get a guaranteed high salary working full-time in tech. A great success in entrepreneurship might mean acquiring your previous salary after several years of working hard and making little money. Of course, you might also strike it right, but you might not.
I'm currently working part-time on retainer, which allows me to work less than full-time and still make enough money to live (definitely less than a full-time job, but enough to live comfortably). This leaves me time to build my own thing while not living off my savings.
I don't know what I'm doing, but I might suggest something like this. Stay at the job for now. Use the financial security to buy a house and get a good mortgage. Then start working on taking part-time work on top of your full-time job. This will suck at first (full time plus extra work), but once you feel comfortable about being able to get part-time work, you can feel comfortable leaving the full-time job.
I'm currently working part-time on retainer, which allows me to work less than full-time and still make enough money to live (definitely less than a full-time job, but enough to live comfortably). This leaves me time to build my own thing while not living off my savings.
I don't know what I'm doing, but I might suggest something like this. Stay at the job for now. Use the financial security to buy a house and get a good mortgage. Then start working on taking part-time work on top of your full-time job. This will suck at first (full time plus extra work), but once you feel comfortable about being able to get part-time work, you can feel comfortable leaving the full-time job.