As far as I know, it's not really about investing for the long term, it's if the coin or project is one that's sustainable for the long period, ~
The important point if we want long-term investment is the real function and strong fundamental support, which is very much needed in real life. Long-term investment also requires strategy, mental strength, and patience. For example, for those who do not understand market analysis for trading, they can take advantage of the DCA strategy for long-term investment.
I am more interested in day trading, looking for opportunities to take profit even if it is small but sustainable. Honestly, I don't have a mental holder.
btw, in the crypto world there is no guarantee that the money you invest will be profitable, there are many unexpected things and the market is very volatile. so never accept offers from people you don't know who guarantee quick profits in crypto, it's very risky.