I can't understand there is a lookup amount threshold of 12 columns/fields per list. Also, on-site SharePoint (server) allows you to change this limit to the content of your heart. We can't touch this setting on the Sharepoint Online site.

THIS IS A VERY LITTLE AMOUNT OF LOOKUPS !!

I think this threshold should be lifted to minumum 30 columns. Please, you need to take action until 1 November 2020.