Why sell now, don't like money? You will not feel too smart when you realize you could wait a few days and he $3,000 more for it.
True! recently before the SegWit, when the price correction was happening, many people have started thinking negative about bitcoin and started selling bitcoin. I am sure they regretting deeply now. I strongly believe that bitcoin will reach 8k USD by the end of this year specially when the positivity is high around bitcoin.
However, you will always see some negative people in the market who will try to discourage you from bitcoin because they don't like other people to become rich. Avoid those people and buy bitcoin. Reward will be huge in near future.