Hello,
You can create a staging site (full copy of the existing one) and update the theme there first.
Also, you will need to install the Kirki framework plugin after the theme update, then go to Xstore > Theme Options to finish migration of theme options.
Did you make any changes in the files of child-theme? We are not responsible for custom changes in files.
But we can do the parent theme update for free.
Please note, that our technicians work Monday – Friday, so on weekends (Sat-Sun) you can get a consultation only.
Regards