Hello,
Go to Appearance > Themes and switch to a temporary theme (like Twenty Twenty-Five).
Then delete the illegal WoodMart version from your themes list. Also, remove the WoodMart Core plugin that came with the nulled version.
Install the Legal Theme:
Download the official theme zip from your ThemeForest account > Go to Appearance > Themes > Add New > Upload Theme, and install the new copy > Install and activate the required plugins.
Best Regards,