https://www.hpprintersupportpro.com/blog/fix-hp-printer-offline-issue-on-mac/

Re-add your printer from the print queue to resolve the HP printer offline Mac issue. Hit the icon of Spotlight and open Printers & Scanners. Tap the name of your HP printer and choose the Remove Printer option. Now, tap Remove Printer when the prompt appears. After that, tap Add Printer, Scanner, or Fax.