Dear Mr. Atheist, how does evolution which is based on natural selection and survival of the fittest, explain the millions and millions of creatures we see?

If it’s survival of the fittest, shouldn’t the number of species decrease over time rather than increase?

I say, if evolution were true, we’d have male reproductive organroaches, sharks, blue-green algae, and maybe three or four other species which are considered by biologists to be “perfectly evolved”. All other species would have died out by now, if they even evolved in the first place.