Emails from someone who was engaging taking 2x longer to respond. (ie a prospect normally responds within a business day and suddenly it's been 3 days...? Strong red flag for enterprise)
Persona/industry/use case - 2-6 versions of each, giving you 20-50 starter templates...then you can insert the custom stuff for all the leave behind stuff based on the call!
Built stuff like this a couple dozen times - really depends on the signals you want to capture and what outcomes you want to drive. Drop me a line anytime!!