What are the income options for an ex software dev

I am in my early 30's and I am almost done with work. I have spent so much time working in startups over the last 10 years that it has taken a toll on my health, i have not spent much time with family and I want to make up for it I don't have enough money to FIRE but if I can have enough income so I don't touch my savings I think i can FIRE in 10 years

What are my options that will let me earn 12-15 lakhs a year. My main criteria is I want to work for only 8 hours a day. I am open to TCS Infosys type companies, taking tuitions, career couching etc.