how much money do you invest? and what percentage of profit do you need to become a millionaire, because if it's only 3-5x profit, then you can invest in Ethereum, because I'm sure that in the next 5 years, the price of Ethereum will continue to increase and will create a new ATH price, so from that you can get at least 3-5x profit from your capital and of course investing in Ethereum has a smaller risk than you invest in other altcoin.