short answer: nothing.
longer answer, depends why you're here. If you believe Bitcoin is long term benefit to humanity, hold or maybe buy. If you're a speculator hold or sell. If you're prone to panic reaction, sell, go and stay gone

I agree. I think what's happening is normal in the trends and movements. Right now, it's just a time when most of the coins, bitcoin and altcoin alike are just going in a bad funk. Everything is going down right now due to many different reasons, some substantial, mostly speculative. However, I think that this is not a new thing in the crypto market, therefore, once it all settles, everything will be in its place and be better.