I've been doing a lot of research into design systems and one thing that's lacking in most of these documentation sites is examples build with the component library. It's hard for me to get a feel for it without being able to click through a real application.
Also, paid managed services on the backend are super common. I want a paid frontend component library. There are very few of these and I think there's room for an all star frontend team to sell professionally maintained, always improving components. Even on day 1 of my company I'd be willing to pay $100s a month for this