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This is the story of majority of people. First time you made this mistake is ok because no one is born perfect and we do not know what will be the outcome. But again people repeat the same mistake. When Bitcoin is at 3.5K, they think its going to 1000$, so they plan to buy when it is more lower. Now when it is 5000$, same people ask "Should i buy now ?"
In my opinion, many traders operate in like manner and at the end, they all end up with lost because; they where unable to understand the movement of Bitcoin at that time. At any given in time; in the price of Bitcoin, many traders would think like this, i will buy when the market get lower than what the market is today. Stupid traders will always wish the price fall further before they buy.