Hi
praveenkumar8860,
Please try below:
If not update make sure to be on latest firmware.
Check if the same charger is charging other phone quickly
Run the phone under safe mode or Factory reset once:
Hold power button for 5 seconds => When the screen flashes with option => Press & hold power option => You will get an option to restart in safe mode
If Nothing works, you can either for an update or visit the nearest service center:
Due to the lockdown, service centers may not be functional. Kindly call the service center before you visit one.
https://www.asus.com/in/support/service-center/india