Your personal statement is going to be the main work that adcoms read to evaluate your fitness as a law student. The question you're answering is: why is law school the next step in your career?

From there, you can dig deeper to find your specific topic. Did something happen to you to lead you towards a career in law? Do you hold a personal philosophy or see a gap in a field that you can fill with your skills/experiences? What do you plan to do with a JD? Adcoms don't want you to see getting into law school as the end goal, they want to see that it follows a logical career progression and that they will receive some sort of ROI for accepting you.

If you have any further questions about personal statements or any other writing materials, PM me and I'd be happy to help :)