The reading problem
Help a reader understand the point before the details.
A concrete example
A statement for a volunteer role can begin with the contribution you hope to make, then explain the experience that supports it. If the first three sentences are all background, the reader has to guess why they are there.
Try this edit
Write the intended reader and one decision they need to make at the top of your draft. Put the sentence that answers that decision first. Move the origin story below it, and delete details that do not change the decision.
Proof on the page
Make a two-column proof of your first draft: on the left, copy the opening sentence; on the right, write the decision it helps the reader make. If the right column stays empty, try “I am applying to help with Saturday sessions because…” as a plain starting shape, then replace it with your own truthful reason. Keep the supporting experience in a separate paragraph so the first line has room.
Where the method stops
Do not compress an entire life history into a claim of being “perfect” for a role. A statement can be short and still incomplete if the reader needs eligibility information specified by the organization. Compare the final draft with the actual application instructions and ask whether the opening answers their question, not a question you invented.