What are some good dermatological treatments for acne scars?

I feel like I've tried almost every laser treatment available, so I'm thinking of trying Rituo or other collagen injections, but I'm wondering how effective they are for pitted acne scars.

I know I can't fill the ice pick completely, but I still want to at least raise it while I'm young.

Has anyone tried Virtu RF? I've heard that high-frequency needles are very effective, so I'm curious about the cost and results.