If a piece of content is indexed by Google and fulfils Discover’s content criteria, it is immediately eligible to appear in Discover. Then comes E-A-T into consideration.
All of the fundamental concepts apply, therefore use Holistic SEO in everything you do. In general, there isn’t much you need to do to prepare for Discover. You must have outstanding content created for the proper audience, as well as a fantastic website that provides an excellent user experience.