Why is it in the past 24 hrs almost all of the altcoins is going down atleast 10 percent in value even though bitcoin's price is steady at $2.5k. Is it contrary or something is really happening. Any thoughts?
Bitcoin has not been steady. It is moving down, albeit slowly.
The alts are more sensitive to the underlying market sentiment. In a downtrend, they tend to fall much more than Bitcoin.
Yup. Also it doesn't help that most portfolio valuation is done relative to BTC so when a dip starts on BOTH alts and BTC at the same time the drop is compounded.
Retracement is a fancy word for a market correction, which is a short hand for "everything grew too quick and now we're seeing the drop to real value".
This happens in any market and there's no magic way to predict when or how far a correction will go, as an investor only you can decide what's right.
Personally, i'm holding most long term, and this drop isn't anything new or particularly scary, i still anticipate long-term growth.