I don't think this question can be awnsered easily.
The price fluctuates a lot and so do expectations. You can't be to sure how btc will be going.
10k were unimaginable about 7 yers ago. But now we are here. The same might happen with the 50k mark. But BTC obviously also could fall
extremely and people may be happy if it would rise to 1k again. For now.. i do not plan on selling my coins. I may do this when required.
But for now there is no specific price for me at which i would sell all of my btc.
As for me I should have that goal of $10K to $15K in order that I can set my holding to that profitable price, but we could not predict the actual outcome in the future. Seemingly the situations of the price fluctuates in an unpredictable manner which we could not determine when will it be rising or falling. Somehow you would be able to speculate without any idea and you'll be surprised after all, because sometimes the price may pump at any situation that you cannot notice actually.