What is the point of having my PF amount which is getting less interest? Is it wise to take 50 to 80% from there and invest in mutual fund and stock market?

It is not wise to make abrupt investments based on recent returns from other options available. While PF may give lesser interest, it is a super safe product (though higher lock in). PF can be part of your long term ‘safe’ portfolio, while equity mutual funds can give higher returns over the long run.

It is advisable to distribute your investments as per your risk profile and ensure that you periodically rebalance them to have steady growth. It also ensures adequate liquidity to meet your life goals and needs.