You can improve your Lead Ads Quality following this best practices:

1. Turn on higher intent for Lead Form Type. You can select between More Volume or Higher Intent depending on the strategy. The second one will give you better quality. 

Ask a short answer that is similar to the auto-filled info (if on More Volume)

Tip: Ask for really necessary information. You can add more questions for more friction, but the quality is not good. Take into account just to add necessary questions. 

2. Remove Facebook in-stream video placements.

3. Add a Greeting to your Lead Form.

4. Adjust your audience targeting. You can select between Interest, Look a Like or Retargeting.

5. Take advantage of Call to Action. Bet on visual content, use eye-catching buttons.

6. Conversion Goal: Send to a landing page with lead form.