Struggling with reading fantasy books in a foreign language

Hey everyone, Im trying to read a fantasy book in english, but I keep getting stuck on new words and expressions. I usually end up skipping paragraphs, which ruins the story.

I can understand youtube videos and normal english books, also I can speak it correctly, but when reading hard books like the lord of the rings for example i get stuck.

I’ve tried dictionaries and some apps, but it’s slow and interrupts the flow. How do you handle reading challenging books in a language you’re still learning? Do you use any tools, extensions, or workflows that actually help you understand without losing immersion?