One idea could be exploring the backstories of the rivals in more depth. For example, what made them become rivals in the first place. Maybe there was a misunderstanding in their past that led to their competitive relationship.
First, you should really get to know the characters well. Read the original work again if you need to. Then, start with a simple concept, like a day in the life of the rivals. It can be a good way to ease into the story.
In many World War Z fanfictions, Australia is often portrayed as a relatively safe haven. Its isolated geographical location can be a big advantage. The vast deserts and strict quarantine measures in some fanfictions are depicted as ways to keep the zombie hordes at bay. For example, some stories might show that Australia uses its naval power to patrol its large coastline and prevent any infected from reaching its shores.
The transition can be well - written by first building up the rivalry to a peak. Then, have a sudden event that makes them question their rivalry. For instance, they both get criticized by a professor unfairly, and they end up defending each other. This starts to break down the walls. After that, introduce shared interests outside of academics, such as a love for a particular type of music or art. As they explore these together, their relationship evolves. The use of internal monologues can also be great, where they each struggle with their new - found feelings for the other while still trying to hold on to their rivalry identity.
Sherlock Holmes and Professor Moriarty are very famous rivals in fiction. Holmes is a brilliant detective, and Moriarty is a criminal mastermind. Their battles of wits are extremely exciting.
In rivals gay novels, there is often a strong sense of competition at the beginning. For example, they might compete for a position, a prize, or recognition. This creates tension.
I recommend "The Cold-faced Knight Dotes on Pretty Girls" and "My Bamboo Horse Is A Little Fierce." These two books were romantic youth-pure love novels, which met the requirements of the question. The male lead of "The Cold-faced Knight Dotes on Pretty Girls" was also a love rival who became a lover, and the female lead eventually got together with him."My Bamboo Horse Is A Little Fierce" was a story about the female lead and her primary school deskmate, the love rival, who eventually attracted each other and got together. I hope you like my recommendation. Muah ~
First, you need to polish your manuscript to make it as good as possible. Then, look for literary agents or publishers who accept submissions in the genre of your novel. You can also consider self-publishing through online platforms.