I think that is a very fatal mistake because you have sold the bitcoin that you have because in fact with the bitcoin you have, you can get a lot of profit, but if you have sold too much bitcoin, then I am sure that regret will come to you.
Why you sold your bitcoin? You didnt tell that. But I want to say that buying and selling depends upon the need. If you need money and you have nothing else except bitcoin then you should sell bitcoin besides you borrow money from here and there. Having bitcoin means that you overcome your financial problems. If you also sold for your financial hurdles then you did well.
I dont think so. Everyone thinks in his own way. I think that the future of bitcoin is very bright. If you hold your coins for long time you will get profit because with the passage of time more and more people get awareness about cryptocurrency and they take interest in putting their money in it. by this way the investment cap is increasing which cause high price in the future.