Struggling with doubts about the Quran’s beauty - salam

As-salamu alaykum. I recently bought a few books, and one of them was written in a very biblical/old-fashioned English by an author I won’t name. Reading it put me in a bit of a spiral about the Quran’s inimitability and the idea that not believing in it is kufr. I kept thinking about how the challenge of the Quran’s inimitability is really about Arabic, and since the book I read was in English that wasn’t the direct issue. The harder part for me is how subjective “beauty” feels. We’re taught that the Quran is the most beautiful speech - its language changed Arabic and is unmatched in eloquence. Still, personally, feelings and taste sometimes make me doubt or compare things, and that made me uneasy. To make it worse, I read online discussions where people compared a modern artist’s rhyming skill to the Quran’s style, saying the artist’s technique is amazing in their genre. I know the Quran is a totally different category, so the comparison isn’t exactly fair, but it still rattled me. So I’m asking: how do I deal with these thoughts and emotions while staying true to my faith and appreciating the Quran’s unique beauty? Should I avoid reading other books to prevent these comparisons, or can I enjoy other literature and music without that harming my iman? Any practical advice or personal experience would be really helpful. Jazakum Allahu khayran.