Has anyone seen this chart?
https://www.lookintobitcoin.com/charts/bitcoin-profitable-days/I've googled and haven't seen any posts opened on the subject.
It shows the best strategy is to HODL, because if you bought bitcoin at some point in the past and still hold it today, you have made a profit unless you bought it in a short period of time (around December 2017-January 2018). If you bought it at any other time (98.5% of the time), you have profited.
The graph only makes the comparison with today, so I understand that 98.5% is not met for any time since the creation of bitcoin, the worst times being November 2011 and January-September 2015.
However, it is clear that, in spite of the short-term volatility, if you just buy and hold bitcoin, you have a very high likelihood of profiting. (This is assuming that the future bitcoin performance will be similar to the past).