There are a lot of long term investors that don't have a targeted price they want to reach with Bitcoin and there are some that has such price tag which they want to reach with Bitcoin and for me I think having a target price will give you more sense of belonging and since you have that focus you will not be tempted to sell off your bitcoin.
Target price has nothing to do with selling off your bitcoin, they are two different things in your accumulation process. People sell off due to panic and not because they don’t have a targeted price for their bitcoin savings. You may have a target price or might have even reached the targeted price but would be tempted to see when there’s a huge crash in the market. Those moments are meant for you to add more bitcoin to your savings in order to reach your target if not reached yet or learn to be patient throughout the period of the dip and not forced to sell at loss.
I have a friend who is into Long term Bitcoin investment when ever he holds his Bitcoin and Bitcoin hit a certain price he was always tempted to sell little and he will, that was how it was for him until he decided to have a price target which he wants to reach with Bitcoin and that was how the temptation to sell when ever there was an increase in Bitcoin price stopped.
So I think having a price target with Bitcoin will help you hold your Bitcoin very well without the feeling of selling, it will increase your patience level.
Your friend was a scalper and not a long term investor of bitcoin as you called him. Bitcoin price is not that volatile like other coins that you’ll immediately want to sell when there’s a little profit from it. Your friend is always selling when there’s a profit on the investment, that means he invested to get the small profits, then leave the market. If he had been selling when there’s a fall in the market, I would have said he’s trying to get over his emotions and he’s panicking to sell as he’s scared of losing his money as a newbie who’s yet to perfect well how the market work and how he can use the market downturn to his advantage always as a supposed long term investor he wants to be or calling himself already.