Definetly long term is the best way to invest in cryptocurrency, i do hold coins almost 3 years and its the best decisions so far. DYOR is the best advice before buying coin and also you should not following hype and stay away from coin which promise you to the moon without any solid reasons.
In my opinion, both long-term investments and short-term investments in cryptocurrencies have the same opportunity,
it all depends on the coins we have so indeed before investing we have to do our own research and analysis,
if we have coins like bitcoin and ethereum it is very good for long term investment