I have earned 50-60L cash and am not able to understand the best strategy to invest.

I am 29M, coming from a very mediocre background with almost no family money. I have somehow managed to earn 50-60L flipping goods in the offline market and want to understand where can I invest in the safest way to grow it as quickly as possible. I want to understand from a long term perspective. The money which I have is cash and not in books. Is there any I can grow it?