This is relative, what do you mean by overvalued, in price or in popularity,? If it is in price, it should be noted that the market capitalization of Bitcoin is not much higher than that of Ethereum, but its price derives from its scarcity, since Bitcoin only has 21 million coins and ethereum more than 200 million coins, so if we do the calculation the prices are exact, on the other hand if we talk about popularity it is normal that Bitcoin has more attention, it is a cryptocurrency that revolutionized everything and the crypto movement started, it has never been hacked and it is much more decentralized than Ethereum.
In fact Ethereum was hacked before and the old Ethereum became Ethereum classic, making a fork with which many lost a lot of money after the hack and many people were not okay with this resolution, that hurt the reputation of Ethereum and the perspective of Ethereum and its supposed decentralization.