Things to try:
Reset the router (used to work)
Delete and reinstall the printer driver on the Mac (shows that the mac can find the printer online, and that the printer is on the network)
Turn the printer off, wait. Turn the printer on. (too early and just this seems to do nothing unless its the last step?)
Consistently, try these things over and over again for an hour. Then give up.
Throw the printer into the trash with brand new perfectly functional freshly replaced ink cartridges because the POS just won’t work. I used to love this printer.
Step 4: Wait 12 hours then repeat the procedure.