I dont like diversifying my investment because you'll only gain a little from it i like investing my money as a whole so you can have big returns. But if i have the funds to invest i'll invest it in two strong currencies with good fundementals and still progressing and gaining revenue overtime that is BTC and ETH.
You can hold however the trouble with holders is that they go all in at once and than hope the price will go up in the long run. That is not what long term investment looks like, if you want to do long term investment properly than you need to divide your money up and reinvest constantly instead of all in at once.
For example instead of putting 1000 dollar into bitcoin at once you can invest 100 dollars monthly for 10 months, that makes it better. Also when people say "hodl" they do not mean 6 months or something, the right way for "long term" investment is until your retirement. I honestly believe bitcoin could be insane amounts when I am 60 years old for example.