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.