in my opinion Ethereum is the best altcoin for now and of course there is nothing to lose to do DCA Ethereum, moreover the blockchain from Ethereum is very popular and widely used, it's just that unfortunately the gas fees from Ethereum are very expensive, so that's what makes many new projects use blockchain from other projects (BSC, Polygon, SOL and etc.), but I still believe to investing in Ethereum for the long term and hopefully the gas fees from Ethereum will go down and can be cheap, so Ethereum will become more popular.
Indeed, the main problem that Ethereum has not been able to solve is the cost of the gas fee, which until now has always been an obstacle and seems difficult to suppress so it can go down. if later the gas fee will be able to go down? I doubt that if the price continues to increase, it is certain that the gas fee will also increase as well.But I totally agree with your opinion that ethereum is the king of altcoins and everyone is competing to invest in it, because no doubt those who hold it will enjoy huge profits when the market has increased.There's nothing wrong from now on to keep saving little by little so that, in time, it will accumulate quite a lot and not miss the profits that occur.