How to invest 1.2 crore for safe, consistent and dependable returns?

Hello, I have a 50 years old relative who has saved up 1.2 crores and now wants to invest it so he can at least make 1L a month. Currently he has 40L invested in small finance bank FD's (Ujjivan, Unity, Utkarsh) which gives an average return or 8.5% a year. How should he invest the remaining 80L so he gets 1L every month in his bank account?