To sum it up--"Buy when the price is low and sell when the price is high, BUT invest only what you can afford to lose."
Sorry — but bro you pretty much just combined like 2 of the most generic trading/investing advice in existence. You made it sound as if your 'strategy' was some new and groundbreaking lol.
Perhaps he still a newbie as far as investing and just 'rediscover' this old adage,
Anyhow, this is no secret, and for sure majority is practicing it, just a question on when they are going to sell those to make profits because that's one part of the equation.
Wait for the next bull run? or sell when you think you have good enough profits already?