I did that not too long ago (end of 2020). Probably mentioned it a couple of times since.

This was almost a full year before the eventual ATH -- I couldn't have known it at the time, but Bitcoin approaching 2017 ATH was already a huge signal of intent and for me a sure marker for a rally.

But circumstances required the cash, and I really didn't have a choice. So I sold most of what I'd built up over the years, with a twinge of regret, but still pleased that overall, I'd come into cash I couldn't otherwise have had saving in fiat.

DCA continued since, so I'm probably even "underwater" at these prices, as we're barely at $25k but I'm confident I'd still have saved up enough to have more on my next liquidation, than if I chose to keep in fiat.