Retired father, need advice with 40 lakhs lying in bank account

We have close to 40 lakhs that we can invest with the aim of capital appreciation (since there’s no immediate need of the money) and there’s already a steady stream of income. Please help me by suggesting a good mix of investment options for my father.

We want to stay away from things like real estate or crypto for that matter.

He’s retired and hence is a senior citizen, in case this helps while suggesting.