How can I achieve Financial Independence and Retire Early (FIRE) by 40?

I am a 25-year-old male, earning ₹1.2 lakh per month. Out of this, I spend ₹30-40k per month, and the rest is saved. By FIRE, I mean earning more than my current salary without actively working. I want to achieve this by the age of 40 but prefer to avoid stock market investments or mutual funds. What alternative strategies or investment options (like real estate, starting a business, etc.) would you recommend to achieve this? How can I maximize my savings and passive income while still maintaining a balanced lifestyle? Any advice or personal experiences would be greatly appreciated!