Market is correcting, nothing unusual about this.
You just have to strap in for the ride, no one can really predict the correct time to enter and exit, those who do are generally lucky.
This is why you always have an investment horizon for money you put into the market and why they say 5 years for equity funds. The simple reason for this is that if you put your life savings in and the next day there was a crash, 5 years is long enough to regain that and then whatever the expected gain was on top of that i.e. 20% pa.
Of course there are always people that get lucky on the timing and get in after a crash or downward correction by luck. These are the guys that claim they are investment guru's at dinner parties when they were honestly just lucky.