Ethereum still has problems that have not been resolved until now, namely high transaction gas fees. However, currently there are many competitors, as you said "since the appearance of Ethereum other chains have appeared and almost all of them are also superior to Ethereum". I don't think, Ethereum is the future of crypto, because there will be many new joining coins that are better than Ethereum in the future.
Ethereum was the first pioneer to create altcoins, but Ethereum was still not developing, with problems such as high and expensive transaction fees still being an important problem for Ethereum until finally several new blockchains were created, such as the BSC network and others, which are currently an important threat to Ethereum.