A cover letter should not repeat your CV paragraph by paragraph. It should explain why this role makes sense and highlight evidence the recruiter should not miss.
Make three points
Explain why this employer, why this role and why your experience fits. Use a specific example rather than several unsupported claims.
Keep it readable
Use short paragraphs, a professional greeting and a direct closing. One page is usually enough.
We write for jobseekers, check important claims and link to official sources where rules may change.