We all have to provide readers advisory for genres we don't read. I have not yet found the high fantasy series that really draws me in. Everyone has those books they can't get into. There is nothing wrong with that - just don't make a big show of how much you don't like reading it.
Here are some sources for news and ideas about fantasy. Science fiction and fantasy are often grouped together so check the post about science fiction for more ideas. The posts about other genres may also have resources you can use for fantasy, you check them out.
For a primer on fantasy subgenres, try this article on The Portalist. Other sites like Book Riot also have them. Searching for any of the subgenres will pull up a lot of ideas you can use.
Goodreads has a page devoted to various genres. They include the most popular books from that genre as well as links to subgenres and related genres. Their fantasy page has new releases, videos, lists, giveaways, and tags that are related to fantasy. The related genres can help you find specific subgenres tied to patron interests like high fantasy, epic fantasy, mythology, elves, unicorns, and more.
Barnes and Noble has a fantasy page, most filled with what the bestselling titles in the genre are. There is a discussion of fantasy there along with suggestions for series for new fantasy readers. Epic fantasy gets its own page as does science fiction and fantasy as a whole. Bestselling titles don't need our help promoting them but they can be used as a read alike display or list that also promotes the holds list. You will also see upcoming titles and information about new trends you may not be familiar with such as cozy fantasy.
I mentioned Book Riot before. Don't forget to just go to their page and search for a genre or a subgenre. Their lists and articles can be very helpful and include a lot of diverse authors and hidden gems. 8 of the Most Thought-Provoking Fantasy Books Ever Written is an example. Your collection may not include all of these but you can use the idea to create a list or display with what titles you do have.
Reactor Mag, formerly Tor.com, is a site to visit for information about fantasy as well as horror and science fiction. There is a section of their site with information about fantasy. Content includes book excerpts, recommendations as well as information about movies and TV shows.
Fantastic Fiction is often used by library workers to find series in order information. There are also pages devoted to genres such as fantasy. There are popular books and upcoming titles along with some subgenre information.
Grimdark is a subgenre of fantasy that is dystopian, amoral, and violent. Grimdark Magazine covers the subgenre and has article like Grimdark Fantasy: Where to Start Reading.
FanFiAddict posts reviews about science fiction, fantasy, and horror. There are also blog posts and articles like this one, explaining cozy fantasy.
