I think adding more "tropes" will just make it confusing, unless you have a plan for how to use them to create conflict.
Certainly there have been many stories (and series) focusing on many tropes: Vampires vs. Werewolves vs Witches. But the authors of those stories have a coherent plot in mind; for example all of the factions are going after the same magical item, so they provide competition and conflict coming from multiple angles.
Your story needs some central problem for the MC to be struggling to overcome (or solve or understand). That is what the story is about. But it has to be complicated and difficult to be entertaining.
Many adversaries (or allies) are fine; too many story lines is not fine. Which is why, usually, stories with MANY magical elements tend to keep the story simple with a clear goal for everyone: In The Lord of the Rings, it is about the good guys (many magical species) trying to destroy the evil Ring, and the bad guys (many more magical species) thwarting those efforts, and causing complications and interference in their relatively simple march to the only place where the ring can be destroyed.
If you have ally or frenemy or villain roles for werewolves, witches, satan, elves, unicorns, dragons, leprechauns, ghosts, possessed birds, whatever -- Feel free. Just don't get the reader (and yourself) lost in a circus of different plotlines, subplots, and side plots. Pick a simple main plot, and one or two subplots (e.g. a romance arc, a redemption arc), and that's it. The more complicated you make your cast of characters, the LESS complicated you make the plot, because you need to keep them from flying apart with a bunch of different goals.
In The Wizard of Oz, we have four characters, with different motives but the same goal, visiting the Wizard of Oz to achieve their goal. The Scarecrow, Cowardly Lion, Tin Man and Dorothy all want different things (they have different motives), but they are bound together as allies by a common simple goal: Following the (sometimes dangerous) Yellow Brick Road to reach the Emerald City and get help from the Wizard.
If you have a wide cast of characters, then you need a similar simplicity in your story.
The advice works flipped on its head, as well: For writers with a relatively simple plot line, a wider cast of allies and adversaries can add enough interest to the story that readers will not mind the simplicity of the plot line.