Selling Bitcoin now isn't the right decision, the price movement of it repeat itself thus it is very obvious that the price is undergoing correction with the possibility of pumping in the next few days presently the price is at $9K+ with $10K as the next target bearing in mind that halving is upcoming and good indication of more bullish movement of the price.
It wasn't the right decision at 10k, why should it be now? It's always got to be in the context of the person, though. You're a short term speculator then you shouldn't be an today's price without a stop loss killing you en route from 8700 on the weekend. You're a mid-term speculator then that stop was at 8k. You're a long termer and you're basically seeing more buy ins triggering right now.
Or you're not a speculator at all, halving is only one more milestone along the big picture game, so this is just another opportunity to reup that we should't have had!