I'm not saying the price can't go down any further because it can. Looking at a weekly time frame, bitcoin is trying to hold support at $10k, if it fails to hold this level, and since there is no clear support level beneath it, I would say it could go down to $8, or even $5k. All of these events are possible, but things keep changing, and only experience traders can analyze the markets and make these decisions on the fly, and even they make a lot of mistakes.
I would say that the wise decision for most people that can afford it, is to hold their coins during this time. If you believe in the potencial of crypto, specially bitcoin, you should believe that bitcoin is here to stay, so these prices are very low if BTC ever gets real adoption. So holding is the best decision.
The same thing goes for alts since they are connected to bitcoin. The only reason they are falling if because bitcoin is falling as well. As soon as bitcoin starts recovering, so will alts.