If you set up an open order with a low target price, you'll be disappointed when the price climbs well above your target price.
If you set up an open order with too high a price, you might not sell at all.
What's your strategy?
I sell at a high enough price to make a good profit. Then I put in an order to buy at a lower price on a dip. The problem is that sometimes you sell high and the price just keeps going up. When this happens you really don't have a good option because this year if you sold at $2500 thinking that was a high, then you saw the price jump to almost $5000 and we may never see $2500 again.
This happened to me so I bought some altcoins instead and I'm trading those now. The other option is to buy more Bitcoin at a higher price than you sold but that goes against the buy low sell high rule. The bottom line is don't sell all your Bitcoins. If you get in this situation, you will still be holding some for long term.