Regarding fireworks photos with
any brand of drone... you will always have poor results due to the needed exposure and time requirements. In the OPs photos above, they are blurry for two simultaneous reasons...
1) As
@herein2021 gave a solution for, you need to have your focus distance set to infinity.
2) The second factor contributing to the overall lack of sharpness is motion blur, which cannot be properly corrected with a drone at night. To correct motion blur, you need a high shutter speed... which will result in significant underexposure under nighttime lighting conditions.
Fireworks photos are best captured with a long exposure of 2-3 seconds so the camera captures the entire arc of the fireworks, as they expand from their central point.
Unfortunately, the only solution for these conditions, is a ground based camera on a tripod with a long exposure... any drone that is hovering, is reasonably steady for shorter shutter speeds... but by no definition, motionless.