I think you should NOW. I don't know if it would be a good decision to sell back at that time, as we can see right now it would have been not so nice, however right now price is definitely perfect for selling. Right now bitcoin is all hyped up once again and correction will probably happen soon.
I realized corrections only happen when the price of bitcoin goes up a whole lot (like it did today) and it doesn't go up anymore, right now it looks like its not going to go any higher, I do not see a 10k very soon, which means price will stay here for a while and then there will be a correction. Sure it may take some time but at that means you can sell now and not worry, eventually it will fall and you can rebuy at that price when it drops. Its quite a good arrangement if you ask me.
And just a few days later bitcoin is getting very close to touch 10000 dollars again, this should show us how unpredictable the market can really be and it is an important lesson for all of us as well, if we want to take an important decision regarding our capital we are the only ones that are responsible for it, while it is important to listen to the opinions of others at the end of the day we are the ones that need to take that decision because our lives are going to be the ones to be affected if we make the wrong choice.