This is because Bitcoin is the king and father currency in the crypto market, as it gained a considerable investor base 14 years ago and was able to spread and gain its reputation on a large scale, which made bitcoin the most requested currency by people, not like other currencies; also, the widespread adoption of Bitcoin since 2009 by large companies and institutions and prominent businessmen made it more attractive to investors and more credible, in addition to the fact that the Bitcoin blockchain technology is more secure, as it makes Bitcoin the ideal choice for any investor or trader, so it is the leading currency in the market. I do not think that another currency can surpass it.
it seems that btc is like s&p \ dow \ other index. but indices are formed by shares. and btc has only faith. some of the tokens are better (some of them are based on business, some on the infrastructure, some of them can provide real anonymity.
So for me the bigger question is how btc could safe its position after years after appearing new really good tokens.