What I mean is that most trader spend their times monitoring the price for hours like 20 hours a day and 4 hours sleep in extreme way or let's say continuously monitoring the market 14 hours with less rest in it, that's the way people can re buy in the right time
But that explanation undermines your previous point
If you are looking into the market once or twice a week, you may see where the ship sails, and thus choose your entry and exit points (mostly, the latter). Indeed, if you make a couple trades a week, this won't make you into a day trader (though opinions may vary), but that still makes you a trader, not a 100% holder
Technically, it is exactly the idea behind "hodling", i.e. to forget about your cryptocurrency investments for a few years (the longer the better). You can see such advices springing up here and here of the forum, especially when someone was unlucky to buy at or near the top. To sum it up, a hodler is essentially a failed trader