Maximize customizability and then encourage/promote creative uses of the resultant features. Heavily promote Nostr as a space where artists can sell their work / get commissions (maybe adding new features to streamline this process) while simultaneously encouraging Nostr users to support and commission the artists who show up. If you can get artists who are already on other sites (and they often are on a LOT of sites) to include Nostr in their line-up of social media platforms, while simultaneously building features to specifically cater to them, they WILL spread the word to their peers.