Hey.
Based on limitations you provided, I can only recommend you to check out University of San Diego.
They have merit scholarship, you can check that here: University Scholarships - One Stop Student Center - University of San Diego
Private, 53% acceptance rate, over 5000 undergraduate student, huge city in California, #113 2021 Best Colleges for Communications in America according to Niche.
Also check out Occidental College. 37% acceptance rate, LA, a lot of merit scholarships, BUT they only have about 2000 undergrads, so might not be the best fit for you.
I can suggest some more if you would like to consider some other states.
Good luck.