Answer:
Well, I can't say for sure since you haven't provided one for me to critique, so
I can't say how to IMPROVE it if I don't know what's wrong with it.
All I CAN do is make a general comment about thesis statements in general, such as this:
Make sure that you have included the topic, your debatable opinion and (though not obligatory) your supporting points. Do not introduce your idea; simply state it directly.
Step-by-step explanation:
Example:
Public schools should require students to wear uniforms because they reduce distraction, promote unity, and ensure student safety.