Endless Loops of Redirect

Endless Loops of Redirect

this is weird... I have done absolutely NOTHING.. all this was done automatically by Zoho and I am rather ticked off.  First the SSL certificate was dropped by Lets Encrypt (as we are a non profit) yet I do have a secondary SSL cert by DigiCert, Inc ( www.digicert.com) from my hosting company IONOS.com  -- so I kept trying to regain the certificate from LetsEncrypt as we had this on our page for the past 4 years.  NOW all of the sudden - I am having massive issues with an endless loop of Redirect.  How can I fix this... SOMEONE HELP!!!!!