I think Ethereum is definitely one of the altcoins worth investing in. In the past, I did not find it right to invest in any coin other than Bitcoin for the long term, but seeing the thousands of developers working on Ethereum and some of the needs of the industry, I understood that it is definitely a valuable asset. Also, I think the important thing here will be the distribution ratio of your portfolio. If you think you have enough Bitcoin, it wouldn't be a bad idea to buy some Ethereum. :)