Car not starting

Start with checking your battery terminals and cables. If there is any greenish/whitish powdery gunk on the terminal/cable, take it off and clean it with a wire brush, sandpaper, or something to that effect. Then put it back together. Be sure that the terminals are tight enough that you cannot twist and loosen them by hand. Any movement there is not good enough.

Guide on cleaning terminals: https://www.2carpros.com/articles/everything-goes-dead-when-engine-is-cranked

Also look at your fuses. A blown fuse could easily cause this type of issue.

Guide on checking fuses: https://www.2carpros.com/articles/how-to-check-a-car-fuse

Did you check the fuses too? Also, check the battery lead cable (+) at the power distribution center/fuse box. And be sure that your battery cables are tight on both ends, not just the battery end. If you have done all of that already, then we will look into other potential problems. But I sincerely think it has to be power distribution related.