Increase List Template Limits
Users are not able to create List Templates in SharePoint Online that exceed 52 MB. The error they receive is "The list is too large to save as a template". The size of a template cannot exceed 52428800 bytes.
This is a ridiculously low limit considering users can upload files that are GB in size now. The current Microsoft list template limits place a strain on business users and IT departments.
At the very least, give business users the ability to clone their lists in real time on their own WITH content.