If it were to drop from now? I reckon it'd be around 50k ish, 40k at most. Highly doubt we'd be seeing anything below that considering that the peak of the market was already 100k since I think the price traces back around 40, 50% ish from peak. Might go lower ofc, but in general, it goes below that at the very least. Personally, I'd start DCA'ing at those price points, maybe even 60k if it does eventually happen.

Still though I wouldn't try to look for the absolute bottom, you're just going to hurt yourself waiting for it. You can maybe calculate losses if you invest in Y price and it drops to X price, then judge whether you can stomach those losses to find out where you can start investing.