As a long-term holder, I just HODL. That saves me a lot of headaches and a lot of trading commissions. You just put an example of what newbies do: to buy after the last ath out of FOMO and to sell after the dip out of panic. This is the opposite of what I usually recommend
My style exactly. I don't want to be associated with all that daily drama of day trading. In hindsight, I can say that holding coins and not dealing with all that minor price fluctuation is far better if you have a normal job and don't have time to react accordingly to ever-changing trading patterns.
I recommend only to sell, buy at major breaking points - ATH is a great time to sell and crashes and corrections are great entry points.
There is some sense in that, notice a positive trend and dont sell into it. I post some relevant tweets I saw today on this:
Dam it, I cant find the other source but the stats were average gains trading in market hours for S&P 500 was -5% This is average, many will profit of course. Out of hours gains, merely buying at close and holding till open was +500% I forget the time span but a very long time. Looking at chart for this stock index, we see it is generally gaining hence the hold even overnight with risk of a sell off on bad news still gains on average because the long term trend is up. Same principle as HODL. I do think keeping up with developments is important as well, not all innovation will occur directly with BTC but also some other blockchains but that question is harder