Email Nurture customers

Email Nurture customers

I currently have 20 services and for each service I have 8 emails. This totals to 160 emails

I will send 4 emails drip feed before the lead is qualified
I will send 4 emails drip feed when the lead is qualified

3 of the emails sent are the same across all services apart from the Images, links & content. The structure will be exactly the same.

What is the best thing to do here ? Especially if i need to scale.