To modify an existing package, you can create a version update.
Open the Asset Store Publisher Portal and navigate to All packages.
Under the Published tab, locate the package you want to update.
Edit the relevant package and select Create new draft to edit. This generates a package draft copy of the existing package.
Make your changes to the draft. Make sure to adjust the version number and release notes especially.
Submit the updated package for review.
Once approved, the new package will replace the original version’s place.