Theme Statement Pitfalls for New Writers? (Seeking Advice!)

Hey everyone, Nina here. I'm currently outlining a new sci-fi project and I'm really trying to nail down my theme statement. All the advice emphasizes how crucial it is for driving the entire narrative, ensuring every scene serves a purpose. I've been wrestling with a few iterations and I'm honestly a bit paranoid about getting it wrong. I've tried some that feel too broad, others that feel too preachy, and I'm definitely worried about falling into common traps.

From the more experienced writers in the community, what are some of the most common pitfalls or mistakes you've seen newer screenwriters make when they're trying to apply a theme statement to their script? Are there specific clichés or thematic missteps that newbies often fall into, where their thematic core actually ends up weakening rather than strengthening their story? I'm trying to avoid those at all costs. Thanks in advance for any insights!