No - if I did, life would be much easier. That's why I continue to monitor sentiment through news, online, and anecdotally in my own life. We're already starting to see a shift as more people view Bitcoin as a bubble which is concerning. I've made enough at this point that I will come out of this with a substantial profit regardless, so will continue to take risks as those risks continue to pay off. There are some potential metrics to watch (Market Cap / Transaction Volume ratio for example) that you can use for ideas of when to sell, but I have a feeling this particular bubble will defy all logic as it continues to rise from 'investors' chasing performance.