There are so many competing projects out there. One project after another.
Old projects are constantly updated, new projects are constantly renewing and diluting assets. So it cannot be a store of value
But for bitcoin, for 15 years it has maintained the old, solid system that cannot be diluted.
One BTC always = one BTC, the beauty does not change, the value does not change.
That is why it becomes the best store of value compared to other assets.