If you are looking for books with great asexual aromantic (aroace) representation, then definitely check out The Hereafter Bytes by Vincent Scott!
It's a futuristic sci-fi novel but is also absolutely hilarious (seriously, the comedy is golden).
The main character and one of his friends are both asexual, and even though it isn't the main plot of the story (which I appreciate), we still get all sorts of little moments in the book about being ace, and a whole chapter dedicated to explaining asexuality to allos with a really nice analogy.
I feel like the main character (who is ironically named Romeo) is super relatable even beyond the asexuality, at least to me. The way he thinks and the way he responds to certain situations is honestly such a mood. I have a whole collection of quotes from this book that are all such giant moods.
Anyway, definitely check this book out. If you are unsure on whether or not to buy it, try reading the sample on Amazon. The first chapter alone sold me.
Age Rating: 14+ (depends on maturity level; book contains language and several mentions of sex, but does not feature any actual sex)