The current market share of Bitcoin is at a high level. A market share of 63.68% is indeed very high. At the beginning of 2023, the price of Bitcoin was only 16,000 USD, but at that time, the market share of Bitcoin was only 40%.

That being said, even if Bitcoin has increased sixfold, the performance of altcoins represented by Ethereum is still not very good.
Bitcoin has long accounted for 60% of the market value, which is clearly an abnormal state.
ETH and BTC are equally matched in terms of decentralization (of course, I believe ETH will undoubtedly be stronger in the long run), and all coins based on ETH can share its security, including other public chains which also have their own strengths. Therefore, it should be an ecosystem of diverse flourishing.
The dominance of BTC in this round is essentially led by institutions, which is a special state rather than the norm. This can also be considered a comeback for early holders of BTC, allowing those old funds and capital to take over. I believe that in the long run, a market cap share of BTC below 40% is reasonable.
I think the current market value share of btc may become a historical high point.
In the past year or two, Ethereum has faced a lot of criticism, but poor performance actually presents more opportunities. Recently, institutions like BlackRock have been aggressively increasing their holdings in Ethereum ETFs, with historical net inflows reaching $6.29 billion, and they are also trapped in losses; furthermore, companies like Bit Digital, SharpLink, and GameSquare.