Good luck in advance.

Try to change your name during the meeting using the Participants Panel 
https://support.zoom.com/hc/en/article?id=zm_kb&sysparm_article=KB0061891

Try Stock Photos from Adobe or similar, Teaser rate "free" subscriptions are available.
https://stock.adobe.com/search?k=zoom+background&msockid=070cc58cbad2616535dad379bb1960f3

Roll your Own Zoom Background:

Adobe Virtual Zoom Creator
https://www.adobe.com/express/create/background/zoom

Try Canva Virtual Zoom Background Maker
https://www.canva.com/create/zoom-virtual-background/