When I came to know about Bitcoin and other crypto currencies, the Bitcoin was 500 US dollars and slowly it fell to 200 US dollars. At that time I could not invest any thing in Bitcoins so I missed the chance now it crossed 1000 US dollars may be it can reach its peak of 1300 US dollars like in 2013 or may raise more than 1300 also. Once again it come down I wish to invest this time, I do not wish to loose the chance.
It is thanks to people like you that early adopters are making money with bitcoin: the very fact that there weren't many buyers back then. The early adopters get the money that later investors pour into it. Why do these later investors pour their money into the pockets of early adopters ? Because they too, think that they are still early, and that still more, later investors will poor still more money into it, so that it fills THEIR pockets. And why would these still later investors do THAT ? Because they think that they are still early, and that there will be still still more still still later investors who will put in still still more money to get it into *their* pockets. And so on.
This is called "greater-fool theory". You are willing to be a fool and give your money away so that earlier adopters get it directly from you, because you are convinced that you will find greater fools than you are, who will put even more money into it, this time to fill directly YOUR pockets. And why do you think that such greater fools than you will come around ? Simply because these too, think that there are STILL GREATER FOOLS to be found.
Of course, one day, anything based upon greater fool theory has to come crashing down, simply because one runs out of greater fools. But that doesn't mean that you cannot use that theory. As long as there are REALLY greater fools out there, you can find them to fill YOUR pockets (at THEIR expense).
In the end, the "last layer" of greater fools will spend fortunes, and lose it. These fortunes are exactly the sum of all benefit that has been made by previous "greater fool gamers". If you make the sum of all gains (that is, money obtained when selling, minus money spent when buying) of all "investors", this is exactly going to be equal to the amount of money poured in by the last layer of greater fools.
The whole difficulty of greater fool theory is to know WHEN this will happen. If you think you're smart and step in, you might very well be one of those suckers of the last layer, financing everything that has been pumped out of it by your predecessors from whom you bought the stuff ; but you might also be in a lower layer, getting your pockets filled by suckers that come after you.
The advice to jump into bitcoin or not, if your goal is to get money out of other people's pockets and into yours, depends on where one estimates one actually is versus that final moment of last layer of suckers. Now, given that bitcoin's adoption is still small, and there's 95% of the world population to be convinced, it is very well possible that you are still in an early phase, and that you can still pump a lot of money out of a next layer of suckers. But it might also be that if bitcoin tries several times to get beyond the $1000 barrier, and doesn't succeed, that people start to wonder if it can still get much higher. That will be the fatal end signal for more greater fool suckers to get into it, and will also announce that all holders of that moment are the final layer of suckers. But it can also still last for 50 years and attract 40% of the world population, and crash down when the price reaches $1 million or so.
The property of greater fool theory is that the last layer is not predictable. The longer you wait, the riskier it gets.
... Hopefully I was not here at that moment, so I can not be tortured by regrets, but that may come, as I have still no major Bitcoin possession, and the price will rise at one moment or another... 
