Guys, this is the long awaited crash. Most coins grew 10x this year based on only hype!! Millions of people buying small amounts resulted in a gigantic upward trend with values based on only air. Now the downward trend started, lots of people will realise they wont get rich anytime soon and in fact lost money. Buying extra is only a way to spread the loss over more holdings.

So expect values to dwindle down to May, June 2017 prices which where much more realistic, so don't put your live saving in alt coins. Remember the DOT.COM bubble burst and then grew until it became as big as it is today.
Also currently most governments are preparing laws to tax BTC holdings and restrict ICO, on top of that the Bitcoin netwerk is not performing anymore and using to much energy to be future proof.
 
If you wanna play, do daytrading. Find a nice trend, ride it a few percent and sell.