I have a core position that I hold for months/years. For shorter term swings, I typically will sell my initial investment if it does more than 2x and leave my profits in to see where or if they run...all depending on the quality of the project. Other swings I sell as soon as they hit 20-30 percent gain.
I tried day trading for awhile but quickly realized how much of my day/social life it consumed. Swing trading and investing are much more conducive for a good social life for me.
That's cool. I see you are able to earn profits this way also. Actually, short term trading (I would like to call it this way... :p) assures profit and you don't need to put many efforts as in the case of a day trader.
But if someone is a bitcoin holder, then probably he can earn good profits this way however other coins won't produce any good results.