Congratulations on the maturity of your FD, and it's good that you are investing your money wisely.
Mutual funds and SIPs are the best options, as you can invest in a diversified portfolio and have a low risk factor. Stock Market can give you high returns, but the risk is very high because of the market's unpredictable nature. PPF is an excellent choice for long-term investments and also offers tax benefits. Real estate can also be a good investment option.