Don't worry as I'll be glad to help, I have a few troubleshooting steps we could try to fix the issue:
Firstly, let's restart the computer, printer, and router
Turn off the router by pressing the power button or disconnecting the power cord.
Turn off the printer.
Close all running programs on your computer, and then shut down the computer.
Press the power button or reconnect the power cord to the router, and then wait for the Internet activity light to display a normal connected status.
Turn on the printer.
Turn on the computer.
Try to turn on Web Services.
If the issue persists, continue to the next step updating the Mac to latest driver from mac store.
And, also refer to the article: https://support.hp.com/in-en/document/c04071740 HP LaserJet - The print job is slow or hangs in the print queue when printing Adobe PDF files
Hope this helps! Keep me posted for further assistance.
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