That is a good strategy. It is hard someone to predict which altcoin has sugnificant potential for growth in price. It is a little intuitive to make the correct investment and in my opinion it should go through a deep investigation on the technological ideas that stays behind it. In this aspect not every coin or token is suitable for investment in the long run.
P.S. I am very suspicious, for example, about the Putincoin or Trumpcoin as they have not any future at all (though its growing proces recently).