Don't solve a problem you think artists have. Solve one they do. Tell them about discoverability or outreach features, community-building tools, active-contest feeds, etc.

Lots of Fedi projects fail because their number #1 goal is to sell their own ideology, rather than providing a useful tool for a community.

If you want people to value your ideas. You have to give them value, not ideas.

Edit: Just thought of a real life example: My uncle is annolder gentleman tech literate enough to use social networks without much issue. How would the Fediverse be a better choice FOR HIM than an Instagram profile? (Let's assume he can easily just learn to use any other platform, which isn't the case for all people)