Q: Rattle sound when going over bumps 2011 Chevrolet Malibu

Hello - I would try to replicate the noise with a linebacker friend or two throwing their weight on one front fender at a time. Your parts replacements thus far are the logical ones, and the ready-mounts (assuming they had new strut plates) should have eliminated the most common source (strut plate and bearing). Check control arm bushings and tie rod ends (both inner as well as outer). It’s also possible it is not a suspension component at all, but rather something on the chassis or a hub cap that vibration has loosened. For professional assistance, I recommend a noise inspection performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, and give you an accurate assessment of damage and cost estimate for repairs.