While this strategy sounds simple enough and everyone knows about it, there are subtle issues with this:
Buy a coin and hold like you intended but take profits when the coin shoot for the sky
You see, 'sky' has no limit. How do you define 'sky'. 2X, 3X, 10X. What is you take profit at 3X and then it goes 10X?
What if, you buy the @$1 then you sell it @$2 then the price keeps increasing to @$5 then stable for a month between $4-$5 because stable for a month now you decide to buy it @$4 because you think the price will hit $5 again even more, but after you buy it the price is dumped to $0,5
This is some example that in cryptocurrency anything unpredicted, unknown, didn't go according to plan
Your way is simple but in real cases can't be done. Ok for OP can you share proof about your trading profits, because people need proof not just nonsense