Is it really a big mistake to sell portion of your bitcoin and then rebuy back when the price has dip?
In the case of long-term investment, I think this is completely wrong. Because Bitcoin is very volatile, when you sell and after some time if you want to buy, if the price of Bitcoin increases a lot in the meantime, then you will have to buy Bitcoin at a higher price. Again, suppose if you invest today at a price of $ 50 and if the price of Bitcoin decreases a lot and if you want to sell your investment and buy again, then you will have lost a lot of money.
I think it all depend on your investment target, if you reach you Investment target and you see that you're in profit of course you have every right to decide if you're to sell some portion and take profit. But you don't have to wait until you meet a buying opportunity before buying again, if you still have enough discretionary income of course you can keep buying little by Little with time you will definitely meet that opportunity you're waiting for. Because if you're waiting for the dip before buying back will waste a whole lot of time in doing that because you can't possibly Predict when the dip will happen that is why is advised to Stick to the steady investing at same time hoping to get to that stage where you will have to buy aggressively.