I'm really new to Wordpress development and had made a mistake by changing a parent theme for customizations instead of customizing a child theme. Not i cannot use the updates that my theme provider provides. Is there a way to fix this? Theme has WPbakery page builder as the primary building extension.
From my answer to I modified the parent theme without creating a child theme (similar question)
As stated in a comment, any changes you made to the parent theme will get overwritten with the theme update.
But, you could copy all of the parent theme code to a new theme folder, adjust the theme header on the copy to make it a child theme. You could activate the copied theme, or make it a child theme, and then dig out the changes you made to the theme. Put those changes in another theme folder, adjusting it to a new child theme name, then activate that new (2nd) child theme.
All of this is a cautionary tale about the importance of child themes.