Why is Ethereum less profitable?

As the number of miners on the network (and the mining difficulty) increases, the income of each individual miner drops by a notch. This is exacerbated by the fact that crypto-whales have started dumping their wallets onto the market, causing a further drop in the value of Ether, and therefore, the income of miners .

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Is it too late to mine Ethereum?

Yes but no . Ethereum is moving from Proof of Work (i.e. mining) to Proof of Stake (i.e. centralized holdings and not much mining) sometime in the future. The current estimated time for this change is June 2022, but that could slip (I think it was originally scheduled for January 2019 and we see how that went).

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