If you peruse the various subreddits on the subject of crypto you'll see incredible frustration among the various communities behind other coins. Faster transactions, more transactions, larger blocks, faster blocks, turing completeness, confidential transactions – yet the price of bitcoin keeps going up without these.
Because bitcoin, at this stage in history, isn't about any of those things. Bitcoin is a system that can be used to reliably store value at no cost. Scarcity and security are the keys to value and you don't need any of those other features. And nobody has suggested any way at all to improve on these features of bitcoin.
So bitcoin keeps on winning on value and becomes the fastest growing way to store value. And of course, its value skyrockets as more value is crammed into it.
When the time comes to go from savings to spending, the competitive landscape will be very different. But you can't spend what you haven't earned and saved, and all of today's alternatives to bitcoin will have failed at earning the position of a savings vehicle.