Don't worry as I'll be glad to help, I have a few troubleshooting steps we could try to fix the issue:
If you have already performed the steps from the document Fixing Print Quality Problems and the issue persists, it could be a hardware failure. Please reach out to the HP Support in your region regarding the service options for your printer. HP Support can be reached by clicking on the following link: www.hp.com/contacthp/
Please feel free to contact us here anytime you need any further assistance. Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.
Be alert for scammers posting fake support phone numbers and/or email addresses on the community. If you think you have received a fake HP Support message, please report it to us by clicking on "Flag Post".