Best strategy: Don't sell unless absolutely necessary.
Buy whenever possible and hold.
Resist the temptation to waste your bitcoins by buying fiat currencies just because the price went up. Be strong.
Do not deviate.
No one's going to sell to leave the money to rot in a bank account, unless they have some sort of condition.
I'm sure many here have areas of their life that they are looking to progress and are exceedingly tired of being chained to this whipsawing headfuck. I sure as shit am. I'd never be fully out of the game but I am extremely keen to not be so deep into it.
When the opportunity arises to exit enough to no longer have to care anywhere near as much it's being grabbed with both hands.