You should always increase your ethereum portfolio. Ethereum businesses will never die. There are 1000s of upcoming projects. And it will drive ethereum price to very high levels, always.
But I do not think putting all the money into Ethereum because that's not sensible. It's like we can never put all our eggs in one basket, and we have to keep some seeds for ourselves, and we can stay until the next time we join them again. Investment needs to be rational.