The price is only down 10% in terms of BTC, compared to what you buy for - this leaves you with a choice, realize your loss (10%) or hold the altcoins.
I you prediction is that altcoin will go over 0.0269 within the timeframe you have in mind then should you hold, else sell.
Keep in mind that bitcoin has gone up more than 10% over the last 2 days, which in reality leaves you with a profit in terms of dollars (why sad about that?)
You cannot expect all altcoins to always goes up, there is also a tendency that the altmarked drop when bitcoin jumps, that is logical, since some want to cashout and take advantage of the high dollar price.
Another free advice: If you are investing (in anything, stock, metal, crypto), never put all the eggs in one basket, spread out the investment. E.g 50% BTC, 20% Altcoin1, 20% Altcoin2, 10% Altcoin3.
If you but everyting in altcoin, then are you more gamling than investing, you might as well roll satoshi's dice.
I read once here at the forum (i don't remember who wrote it): "always keep one bitcoin safe and never use it".
Personally I like that advice a lot