You don't need to hodl all of your money in Ethereum. You can sell some Ether to invest in others coins. But, yes, you must hold some Ether for the better future. BTC is growing and Eth will be growing very soon. It is always a good thing to hodl some ETH and BTC. Good Luck.
Yeah, you are right. However, for an investor, not is a gambler, I need to have the reason to hold Ethereum for the next time. At least, I have some plans to hold Ethereum until it starts to change the PoS system. ASIC mining is changing the mining ecosystem recently. Mining Ethereum can become a problem to change the system of Ethereum in the next time, I think so.