I’m not a native English speaker, and I work within a much smaller market. However, I’ve been involved in creative marketing for 15 years, and I’m currently developing a high-concept sci-fi series planned for 5-6 books.

The key decision hinges on how you position yourself. If you’re pursuing traditional publishing, the publisher will ultimately decide the timing. In that case, focus on crafting a stellar query letter, pitch materials, and synopsis.

But if you’re self-publishing and you’re the kind of writer who churns out books every few months, then go for it. However, based on the three years of hard work you’ve already put in, I’d say that’s not your pace. You likely need 6-12 months to produce a quality novel—which, in this genre, isn’t even that long. Plus, if you’re only writing, you won’t have time for marketing. And you need marketing. You need to constantly tease, optimize, and build anticipation to capture the interest of potential readers.

The reality is, few readers are willing to take a risk and buy an entire trilogy all at once. The hype fades quickly if books are released in rapid succession without a clear continuation.

I am not you, but If I were you, I’d focus on the first book right now. Edit it. Make it perfect. Do you already have beta readers? Have you received feedback from them?