My personal strategy is to diversify into 20 coins.  Within those 20 coins, I choose a variety (value, platform, storage, payment systems, etc.)  I do this because at this early stage everything is still pretty much in development stage and no one really knows which ones will succeed or fail.  This covers a broad area so I don't have FOMO.  I might invest heavier in a few projects I believe in or understand better.  With so many coins and projects out there investing in just a few coins make one seem like a prophet or maybe they just have balls.