For noobs, HODLing is a term used for "holding" your assets (here: Bitcoins) for a very long time. But, isn't it true that those who bought it at $500 once should have sold it at $20k peak, and if not, why didn't they sell at $15k? BTC didn't crash all at once and they had the opportunity to sell and wait for another opportunity. A $15k per BTC against a $500 BTC - means a 30x return itself. And BTC crashed to $3k, if not $3k, then these hodlers would have bought back at $6k which is even less than half of $15k as they would also have added a lot more liquidity to the markets with too much money on the table. Isn't it true that too long a hodl can stop you from taking great opportunities while sitting dumb and waiting for a specific target?
I would say the best investment strategy in the Bitcoin market is still "Buy & Hold" until you have REALLY good understanding of the market structure and macro factors that influence Bitcoin price. It's always easy to reflect on potential investment decisions in the hindsight but not always easy to execute right trades in the right time even when market structure looks obvious.