What is the best price for selling Bitcoin in April 2018?
Your questions is really out of the context.
Well then, if I will buy your question thinking you are really serious, the best thing to do is....... you will only realized what's the best thing to once you are now next month to your preferred price level. What do I mean here?
..If you need money badly, dump.
..If you can't take anymore the stress, dump.
..If you just want to convert your bitcoin into fiat, dump.
..If you afraid that tomorrow there might be dump, dump.
It's your decision after all because even bitcoin price will reached $50,000 next month, we have different views and means about "what is the best price".