When I fly my fpv drone after flying another quad I noticed  that my throttle stick doesn't react till almost half throttle is there a way to adjust this for better response. Thanks

Hi, there. Sorry to hear about this. Could you please tell us which controller you use? If you use DJI FPV Remote Controller 2, please try to calibrate the controller to see whether the abnormality persists. Here are the steps:
After linking the DJI FPV Remote Controller 2 to the DJI FPV Goggles V2, go to "Settings" -> "Remote Controller" -> "RC Calibration", and you can then run calibration for the Remote Controller 2.