How to invest in markets at 20000 levels?

Investors want to know whether the upward march of Sensex will continue forever. Those who have missed the bus want to know if they can enter in these levels. Moreover, everybody is curious about the long-term prospects of Indian Markets.
It is true the market will be volatile in these levels and there may consolidation and profit booking but these small downturns actually eliminates weak investors from the markets makes it stronger in the process. There was a time at 5000 levels, when a 100-point fall in market created a panic in investors. But now its not as the base has increased. One can expect a downturn of 500 to 700 points at these levels and this volatility is quiet expected. Considering there will be high volatility in these times, speculating in stocks can be injurious. The market always rewards long term investors with lot of patience. But to my view, if you have achieved your set target of returns from the market, you should exit. But if you ready for betting more, even then it will be safer to book partial profits and re-enter when there is a correction. According to market history, long-term investors should not have any reasons to worry. Economic fundamentals are good. Companies are expanding and their profits surging. FIIs inflows continue unabated. So try to invest judiciously, and preferably in Sensex stocks that will offer you much need protection from volatility inherent to market in these levels. If you have already invested in market, then it will be wise to keep the winners of your portfolio and do away with the ones, which gave average or low returns. Indian economy is robust and India story will continue for at least 5 to 10 years more.