And full of sorrow when it falls

Whatever goes-up so quickly, will fall so badly.
Hopefully, not the case for bitcoin. We always want a mature market, less volatile, and more adopters.
$19k is just a beginning before the real Bull-run in 2021 when more investors recognize bitcoin as a digital gold as a reserve asset.
And that what exactly happened way back in 2017. Bitcoin grows at a fast rate that is why for the next year it goes down drastically, but I don't think today's bull run will not be the same because the growth seems strong and mature compared we had before. Bitcoin before was more likely affected because of the FOMO while today's was because of the institutional investment. I also believe that we're only in just the beginning and today's bull run could be more.