I think that you're being emotional and shouldn't invest at all if you can't handle massive red candles. Selling now is like buying at >15k. Now is not the time to sell, but to keep cost averaging in.
There is no guarantee that bitcoin will really bounce back one day . I believe it will, but I am totally unqualified.
Putting more money is foolish, if you already put all the money you have reserved for high risk assets.
In past it bounced from much lower marketcap, much lower media attention, much lower infrastructure (exchanges, media, wallets, ATMs, stores that accept etc).
It's not certain that it will ever reach 10k again. I believe it will, as everyone here. But how much are you willing to bet that it will? That's he point.
If you already put all that money in that's on you for not keeping enough powder dry. But regardless of how much fiat you have available, selling after a ~90% drop is anything but sensible, especially when that's roughly been the turning point for most assets that plunged and didn't die. Market cap is irrelevant too by the way, at least in the peanut amounts that we are at right now. Apple is still 10x the size of Bitcoin. And that's just one company. Bitcoin is well positioned to become the backbone of future finance.