Some novels ask how we should live, not merely what happens next. Philosophical fiction rewards slow readers. Try Murakami and Orwell in modern fiction, then move to Marcus Aurelius and Russell in philosophy books.
These books are worth reading slowly and even twice, and they make wonderful discussion picks for reading groups and thoughtful friends.
Novels also build empathy and vocabulary without feeling like study, which makes them perfect for readers who want to improve their English while enjoying a really good story in their free time.
The best way to find a novel you love is to follow your mood. Read the first few pages, trust your instinct, and never feel guilty about setting aside a book that does not grab you.