You may want to have another look at the troubleshooting procedures. There are a couple of things that you haven't yet specifically mentioned:
https://support.hp.com/us-en/product...ment/c03944809
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Solution two: Allow automatic servicing to complete
Your printer has an automatic servicing routine that can solve many print quality issues. There is nothing you need to do. The print quality should improve a few hours after you experience the issue.
If you cannot wait for the automatic servicing routine to complete, continue with the following troubleshooting steps.
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Solution six: Print and evaluate a Print Quality Diagnostic Report
Step three: Make sure that the cartridges are properly vented …
If the vent on the top of the cartridge is clogged or obstructed, the cartridge might not work properly. Follow these steps to make sure that the cartridges are properly vented and seated correctly.
7. If the vent is clogged, use a straight pin to gently remove excess adhesive from the vent.
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