Your Focus Is on the Hero, and Heroine, So Keep Them Together
“Billionaire” romance is hugely popular. Let’s say you decide you can write billionaire romances, so you plot out a simple story. Girl meets billionaire, chaos ensures with internal obstacles (billionaire hates mouthy, take-charge women/ girl hates arrogant men) and external obstacles (whatever), billionaire marries girl.
Keep your focus on your two primary characters. In a romance, aim to get the hero and heroine together as soon as possible, and keep them together as much as possible.