Not leaving a corporate job, but slowly transitioning from freelancing to working on my SAAS business (https://www.scraperapi.com) full time. I'll throw out the suggestion that maybe you should seek a bit of freelance work on the side so you can have some level of income while you work on your business. Even if it's just 5-10 hours a week, if you can get $100/hr from someone for that you can cover a large portion/all of your living costs if you live frugally. Good luck!