If I created the perfect language tomorrow the very first problem is that absolutely nobody would have any experience in it.
It would also have no other ecosystem. No books. No tutorials. No mentors. No libraries. No frameworks.
And even as it got those things, they would remain immature and incomplete for a long time when compared to the ecosystem around languages that are decades old.
I could also make an operating system that was superior in every way and it would fail because there would be no apps for it.