After a (light) crash, the view of my brandnew Avata2 seems out of focus. Can I solve this problem by myself?

You would have to take the camera module apart to tighten the lens and glue it in to prevent further loosening. I'd send it to DJI for repair, they might do it for free if logs show that it was really a minor crash.

Hi there. Thank you for reaching out. We're deeply sorry for the incident that happened to your unit. Since the drone experienced a crash, I'm afraid that you may consider sending the unit in for proper diagnostics. You may submit a ticket case at https://repair.dji.com/repair/index. Also, the warranty can be applied depending on the outcome of the damage assessment including the warranty period of your unit. We appreciate your kind and understanding.