I’m having issues with the car cranking, I’ve ran into this situation before (7 months ago) where I replaced my Starter, which fixed the issue. The car was working fine today, until my brother tried to start it up and the engine isn’t cranking, I tried to jump the battery, but it wasn’t turning. I’ve done my research before and it led me to three focus on why it’s not cranking:

1. Battery
2. Crank position sensor (CPS)
3. Starter (which shouldn’t make sense due to being replaced less than a year)

I figured with the common issues being one of these three, since I’ve already replaced the starter it leaves either the battery or CPS, which I’ve yet to replace. Any suggestions will help, thank you in advance.

You should check the starter relay, too.