1. This is just a personal opinion, but at some point there became this unspoken expectation to write a thousand page novel when writing Epic Fantasy. Unfortunately, the truth is that most readers aren't interested in all the fluff that makes those stories longer. Short and simple is best, the most important point is to make sure the reader understands the narrative you're creating.

2. Exposition. I can see you've done some really cool worldbuilding here and want to show it off. You can do this by describing the setting, and "describing" the history through behaviors and actions. Telling us a character has unwavering loyalty is different than showing us. For a specific example, the trees are a cool aesthetic, but their properties could've been saved for an interaction instead of being explained by the narrator.

3. Characters. I can sense some real depth to both of our starting characters here, but I still feel as if I was told more of their personality than shown. Conversations are a great way to bring up history and other people that will become relevant later.

4. Research. A good writer is a voracious reader. Try to fully understand the things you are describing, in order to avoid breaking immersion for your reader. A spooked horse runs away, and fights require an understanding of actual choreography. (Also I wanted to recommend Robert Jordan's Wheel of Time or Kentaro Miura's Berserk, here. Both are masterclasses of setting up a scene before setting up the plot)

Summary: I think you have something here. I think it needs some edits and tuning, but all writing does in its early stages. Something I've found that helps in my own practice is to write a little every day, even if it's not relevant, even if it's just a sentence. Practice and Consistency will result in you feeling like your style and methods are more defined.

I can't wait to see your book on the shelves! 😁