Long-term investment is good for patient people, if you are impatient you can go to altcoin, it is a short-term investment, I prefer long-term investments such as BTC or ETH, the reason for long-term investing is I do not need to see market prices every hour, we only need to look at the market price in the next week.
It's not a long-term investment, just for safe coin like BTC or ETH. There are lots of other altcoin coin like NEO, LTC, it's worth the long hold, the important thing in long-term hold that is forgetting your coin and thinking that you are going to profit next year.