There is always an opportunity to buy back at any time you please. But the question is, will Bitcoin decline to the price you have in mind to buy back? If you trust it will and you have already made some good profits from your Bitcoin investment, you can go ahead to sell your Bitcoin without giving anyone an explanation or permission for that.

We are all investing in Bitcoin on our own accord and at our own risk. Any future profits or losses are on each other's heads. Do what you feel is okay for you. If you feel like selling now, sell. If you want to postpone selling now, fine and good. But don't blame anyone for whatever decision you take. The decision is all yours.