My theory is that humans evolved already and we’re fish in a stream left behind

As I watch a school of fish in a stream I think about how they got left behind in evolution. We were once at a similar point of evolution as fish were. Chance, circumstance and luck drives evolution. Without being at the right place at the right time your genes stall out. All the creatures on earth have stalled out in comparison to humans. My theory is that we too have stalled out! That humans or human like creatures long ago took on more evolutions. Enough evolution to leave the planet, even to leave the dimension. To them, being an ordinary human is lowly like a fish in a stream. They continued to evolve and absolutely didn’t need the earth anymore. Maybe they left the earth 500k years ago, maybe longer. Maybe they took all of their tech with them and we are the lowly tribes that they left behind. Maybe we’re rapidly evolving right now but for hundreds of thousands of years we were way behind.