Incorrect. Better to be a seller at 1200 and buyer at 350.
Do not forget the mantra: buy low, sell high
Yes. It's buy low, sell high NOT buy and hold
If you get the 'buy low' part right, that is good enough.
Changing 'selling high' to 'selling when you need fiat' is making sure you are not left out of the party.
That's my strategy, as a matter of fact, using the SSS plan as a guideline for how much I can sell. Then if the price drops, buy back again. Worst case scenario with this method is that the price goes up without ever going down again. And that would be terrible.