Home sharing issues

Yesterday, I was unable to connect my iPad to my iTunes library via Home Sharing. I have been able to do this before. I have an 2011 iMac with High Sierra- OS 10.13. The iMac is an older computer and can’t run Mojave or Catalina.

My iPad is a 5th Generation model with iOS 13.1.3.

What has gone wrong? Any suggestions will be appreciated.