Credit Repair Specialist Credit utilization optimization

I'm seeking an experienced credit repair specialist to help my client improve their credit score to above 700. We have sent letters over the last 2 months, and the score has increased 100 points but I'm having difficulty getting it to over 700. Currently their score is 645. We're looking for a professional who has a proven track record of success and a positive, results. We need someone who understands the full toolkit: disputing inaccuracies, negotiating with creditors, securing goodwill adjustments, and implementing a comprehensive strategy tailored to the client's situation. If you're confident in your ability to deliver real results and you're someone who genuinely believes in turning things around, please respond with how long this fix should take. Thanks