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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.
Possible, but let's say we top at $180k this bull run, there might be a chance that during the worst bearish season, we might see the price -50% or higher. So with that, maybe around $80k-$90k. But we will see, it really depends on how big we will be in this stretch of the bull run.
There are pundits who thinks that $200k is doable or even higher, so there's a lot of expectations that we are still looking for. We still have a full twelve months, and with Trump going to sit in the White House, the US policy on Bitcoin will have a greater influence so the our all time high for this bull run is still very open for price speculation.