I bought in the mid 50's.  I'm not concerned about being underwater today, but in the ride up there will clearly be frequent predictable 10-20K drops, so I should not hold at $55K.  It may pay to keep trading it up.  Meaning I should next sell at 60K + and buy at 55K then sell at 70k and buy at 60k.  This is a predictable pattern for BTC, no?