I would suggest you to go for it when the price reaches the $20,000 as per your set figure because I don't think it would take much longer for bitcoin to reach $20,000 and I would suggest you to sell off 50% and Hodl on to remaining so that if the value of Bitcoin increases you may sell it during it's peak or else if the value starts to dump you may sell it at the first dump or correction itself, it's work taking this risk as your loss might be minimal if the value drops but profit will be more if value pumps further than $20,000