If you aren't blind sided by hype, euphoria, etc. by the end of the bull run, bear runs can be great. A well-timed short can be extremely. profitable, not to mention the chance to accumulate as you said.

Personally, I prefer when number go up (bull run). I don't like the idea of shorting as it feels like a betrayal to the asset, especially if it's BTC. While accumulating is great, a bull run is needed to make it worth it. Usually the accumulation is a grind, more than an enjoyment.