The strategy is good if the market is trending quite well, but I prefer to follow the rules and not wait for the coin to pump to the moon so that I can take the biggest profit. Once my target profit hits, I exit in most cases without thinking twice.
And as much as I use your style of a fixed stop loss with some trades, I definitely can't afford to do it with others, and the kind of asset I trade at that time matters. If I trade gold, for example, I can't imagine myself leaving my stop loss at the same level after capturing about 150 pips in the trade.
I have support and resistance strategies that show me the accurate places to place my stop loss, and at that time, they must have shifted ground for me to safely lock my position in profit.