If you hold Bitcoin intensively, you can buy Bitcoin anytime, anywhere. Many people make many types of investments, short-term placements and long-term investments, long-term investments are made by many for 10 to 15 years. So I think Bitcoin is only suitable for long term holding, and other coins are not suitable.
Bitcoin is also very good to use for short terms, it's just that you have to have good timing when trading, the slightest mistake will only make you lose, again as i said above, the DCA method and buy the dip is a good strategy for long term investment in bitcoin.
Bitcoin is not good for Trading trading with bitcoin is just like gambling. I have not seen a person that made fortune from trading. I detest the word trading because when I was doing trading I constantly gain and loss and the loss was more often than win. Instead of getting a good profit in return I always lose. When I buy when the market is bearish, it tent to remain constant without making any move to become gree but imidiately I sell of the market tend to be green like I was the one that made the market stood still . After having several issues on trading I have decided not to trade anymore. I have started accumulating bitcoin gradually despite it is small, but its better than to trade or invest in some sort of shitcoin that wouldn't profit me in anyway. But accumulating gradually like $5 *4 weeks =$20 then $20 *12months = $240. Then multiply by how many years I intend investing, it will be way better than trading at lost or shitcoin investment.