Ethereum is a must-buy if you have money to invest in long term. It is really better to diversify rather than focusing only on one cryptocurrency, this way you can maximize your potential profit in the long run. Some of them will be x10 now in few years, others can give you x100 if you belong to those early adopters of that coin. Just look at the price of the top coins now like BNB, ADA, and ETH few years ago, they were really cheap so people who have bought them at that time must be rich now.