I don’t believe this is a GP issue. Your site is using the Marketer template and here is the performance of the original template: https://www.screencast.com/t/AxN326tj0
I feel like something else is causing the LCP issue – can you disable all plugins except GP Premium to test?
I can of course, but I am worried this will ruin the site. Note sure what will be lost after I enable them again.
Have them 7 extra: Add Inserter, AIO SEO, Classic Editor, Classic Widget, Easy Table of contents, kk Star Ratings, and Recent Posts Widget With Thumbnails.