Dark Matter gravitational lensing seems pretty convincing.
https://www.nasa.gov/content/discoveries-highlights-shining-...
Clinging to a single dominant theory is religious orthodoxy, not science. The essence of science is, "we don't pretend to know what we don't". There is plenty we do, that doesn't depend on DM.
https://you.com/search?q=Weakly+Interacting+Massive+Particle...