You are absolutely right that long-term holders get a bigger profit than short-term traders as it is so difficult to guess where the market will go as there are too many factors that can influence on market. Personally I follow the strategy of buying almost every month some Bitcoin and other solid crypto currencies, it is my monthly investment.
This works to those who are into long term investment. It’s actually good decision to buy when we have money since BTC is still able to pump in price in the future especially when more industries take bitcoin as form of payment as well as investment. But in altcoins it’s only good for top coins but not in other coins that may lose their value more when they are unable to recover whenever the market is at dip.
I'd rather choose those coins that have strong fundamentals especially when we are holding long-term which is pretty different when we just make a trade as we obviously choose those who are having a huge market volume. That is the basis of how I choose coins and that it seems to work for me but can be different from others.
Well, to buy coins during the dip is the best option but to have a trade during the bearish season is in a huge struggle, in fact, you can neither sell at a lower price, it is a loss, of course.