How do I keep my audience income durable over the long term?

You have done what many chase and few reach: your reach actually supports a real living, through more than one steady stream. That is a strong place to stand. But durable is not the same as permanent, and it sounds like you want to keep it that way rather than watch it quietly erode. That instinct to protect what you built is wise. Nothing stays solid on its own. Durability over the long term comes from not depending too heavily on any single stream or any single platform you do not control. The ground under creators shifts. Algorithms change, tastes move, a platform you rely on can turn overnight. What lasts is a spread of income where no one failure sinks you, and a direct line to your audience that no company can take away. You have the streams. The question is how fragile the ground under each one is. Look honestly at your setup and find the single biggest point of failure: the one platform or stream whose loss would hurt most. Then spend the coming months reducing that dependence, especially by owning your direct connection to your audience rather than renting it. You are not fixing a problem. You are fortifying a good thing so it keeps standing. Start by naming your biggest vulnerability this week.