i tried this and it didn`t solve the problem.
and also searched and found this solution
and still same problem.
and below is the output of
optimus-manager --status
WARNING: hybrid mode is set but Nvidia card does not seem to be available for offloading.
Log at /var/log/optimus-manager/switch/switch-20201126T191323.log
Optimus Manager (Client) version 1.3
Current GPU mode : hybrid
GPU mode requested for next login : no change
GPU at startup : intel
Temporary config path: no