I'm always doubtful when taking profits when altcoin rises 2x or more than that. Sometimes I'm only taking 20% from my profits before but then I knew it was smarter to sell everything. I did it once and then I was lucky to buy it back again it in a much cheaper price.
I think the best strategy for today specially on this huge dip is to buy more coin and hold until such time that it will rise up high soon. But I think this kind of strategy need to have a big patience in order for is to sustained the amazing continuous market dip. I believe that patience is really a virtue if we are going to do buy and selling process.