One great 'enemies to lovers' romance novel is 'Pride and Prejudice' by Jane Austen. The initial animosity between Elizabeth Bennet and Mr. Darcy is palpable, with misunderstandings fueling their dislike. But as the story unfolds, they come to see each other's true natures and fall in love. Another is 'The Hating Game' by Sally Thorne. The two main characters are office rivals who constantly bicker and compete. However, beneath the surface, there's an underlying attraction that eventually blossoms into love.
A really good one is 'Red, White & Royal Blue' by Casey McQuiston. The main characters, Alex and Henry, are from different worlds and start off on the wrong foot. They represent different countries and have political differences which create an 'enemy' - like dynamic at first. But as they get to know each other better, a beautiful romance develops.
You should check out 'Wuthering Heights' by Emily Bronte. Heathcliff and Catherine start as something like enemies in a way. Their relationship is complex and filled with passion. There's a lot of strife between them, but also an undeniable love. Also, 'Beauty and the Beast' in novel form can be considered. The Beast is initially feared and disliked by Belle, but through their time together, they develop deep feelings for each other.