edited out
Everything that is too much is bad and that is why you fail right there but that should serve as a lesson to you that next time you might need to sell once the value cross on your buying price. Sometimes it's better to earn small than not earning anything at all.
We are not talking about selling in this thread.
Furthermore if you are in BTC accumulating mode, then selling is not a good tactic for BTC accumulation - even though there can be ways to employ selling for various risk management purposes.. but still that is also not the topic if this thread.