Hi Rachit!
You could download your content from h5p.com and upload to the Content bank, but for now there is no way to synchronize h5p.com and your Moodle site. That means that your changes on Moodle won't be applied on your h5p.com site, and your changes on h5p.com won't be applied on your Moodle site.
If you want to keep using and editing all your content in h5p.com, you could embed it in your Moodle site using 'Display H5P' filter available since Moodle 3.8.
For more information see https://docs.moodle.org/39/en/Display_H5P_filter
You could download your content from h5p.com and upload to the Content bank, but for now there is no way to synchronize h5p.com and your Moodle site. That means that your changes on Moodle won't be applied on your h5p.com site, and your changes on h5p.com won't be applied on your Moodle site.
If you want to keep using and editing all your content in h5p.com, you could embed it in your Moodle site using 'Display H5P' filter available since Moodle 3.8.
For more information see https://docs.moodle.org/39/en/Display_H5P_filter