I sold about 10% of my stash. I'm not sure whether the bubble has burst or not, but I decided I'll take some profit (bought at sub $100). We might see $5000 or $10000 in the next few days, but I'm pretty sure the price will go down to $1500 (or even lower) at some point in the next few months or next year, and that's when I'll buy more. If that doesn't happen then it's fine, I'll invest in something else.
What do you think of my decision?
I don't think it's a bad idea to sell some at these high prices especially if you bought at such a low price. You have locked in some good profits even if the price doesn't drop.
I would expect a price drop and I could see it go as low as $1500 or lower if there was some sort of bad news. You will probably have a chance to buy back some of what you sold.
I would say still it's a bad idea becuase if you completely aware of bitcoin price movement from the starting time to now and adoption on block chain technology you will never do that now. If you wait till next halving sure bitcoin will on moon.