Investment is to be done in a balanced manner and one should divide his investments in various instruments available in the market. Some of the avenues are Bank FDs, Shares, Post Office schemes, PPF scheme, Mutual funds, Bonds, Company deposits etc. One has to invest in these schemes as per the funds available with one as well as the risk perception. Some schemes are riskier than others but there are chances of more gains also. Out of above options shares and company deposits are more riskier than PPF, Bank FDs and Post Office Schemes.
Now coming to the Mutual funds, these instruments are somewhere in between the above two categories and that is the reason why many people are opting for them. So HDFC AMC also has some good MF schemes and one can make investment in them. In your case you have to see your total amount available versus already invested in different risk categories and accordingly have to take a conscious decision.
I want to just mention one thing here that mutual funds AMC invest in market instruments like equity and debt instruments and are affected by the fluctuation in the market so it will not be possible to make a gain in short periods so it will be better if you keep your investment for long periods to derive good returns.
Knowledge is power.