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Waiting for the price of $90k-$100k I think will take quite a long time, and you have to be patient for that, but regarding whether that will happen or the latest ATH I think a lot of people believe it will happen, even though in a slightly longer period of time.
And indeed the right time for us to sell is when we really see the latest ATH (if we can be patient) or many people have different opinions, sell when we already have or have reached our target.
If the selling price is what we want, we really have to be patient until the price reaches our target selling price.
And even though that means we have to wait quite a long time, that's okay because while we wait, we can accumulate more bitcoins to increase the number of bitcoins.
The price of bitcoin will rise in the future, although there is no certainty when that will happen, so we have to be more patient in waiting for it.
When the Bitcoin price reaches the target selling price, immediately sell it, even if not all of it, because we don't know if the price can stay at that price or will immediately decline due to a correction.
So use the time to sell at the price we want.