Very specific. "Making money simple" is stronger than "finance tips" because it's a promise, not just a topic. Specific positioning is what makes a brand memorable.
They don't need to "match" the niche, they need to differentiate you within it. A funny, direct voice in a serious niche like finance often stands out more than a purely formal one.
Review it every 90 days. Your niche and audience understanding will sharpen over time, and your brand statement should get more specific, not change completely.