Personally, once the domain name is bought and established, I'd leave it out of my consideration of the
SEO work that needs doing from then on. You can get a some mileage out of naming logically web pages and folders, and that would be my next option - e.g. confetti_shapes.html confetti_for_weddings.html confetti_for_parties.html - this gives you a lot of flexibility and leverage for well-tagetted pages.