Try to follow the steps in this document: https://support.hp.com/in-en/product/hp-deskjet-f4200-all-in-one-printer-series/3390945/model/3571309/document/c01371258 for Faded, Missing, or Dull Colors in Printouts.
If the issue persists, I would personally suggest you contact our HP Support for one on one interaction.
Please use the following link to create yourself a case number, then call and it may help speed up the call process:
Step 1. Open link: www.hp.com/contacthp
Step 2. Sign in / sign in as a guest
Step 3. Enter the product number or select to auto detect
Step 4. Scroll down to "Still need help? Complete the form to select your contact options"
Step 5. Scroll down and click: HP contact options - click on Get phone number and phone number appear.
Keep me posted on further assistance. Hope that helps!
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Have a great day ahead!