Originally published at: https://www.feverbee.com/dropoffpoints/
Run a cohort analysis (Google Analytics/Community-Analytics can help) and identify the most common drop-off points.
Be aware that the biggest will always be between week 0 and 1. There are ways to tackle this, but ignore this group for now. This group skews your data too badly.
Look at where the remaining 20% or so of survivors begin to drop-off.