https://bigthink.com/starts-with-a-bang/universe-13-8-or-26-7-billion-years/
Tired light theory requires:
Distant galaxies to be blurry (they aren’t)
Events in faraway galaxies to happen at the same pace as nearby events (they don’t. Time is dialated just like frequency is redshifted)
Cosmic background radiation would not be a black body
Constants c, G, and hbar would change through the history of the universe.
This inspired me to go into science.