If i was in your place i would keep the alt coins. See it as long term investment.
Also i would inject more cash buying other coins which the price is attractive.
Building a diversified portfolio is the best strategy for me.
Keep a core amount of coins you would never sell and each time you see a hype in a coin sell some coins and buy back when drops.
this is what i do and is working pretty well. Not always but most of the times.