Learning fast
To help better understand the problems and opportunities at the key points in this funnel, I set about gathering fast, qualitative feedback from users.
This took the form of remote usability sessions using Ping Pong, and surveys targeted at specific cohorts of users (namely, those who had opted out of push notifications) using a combination of BigQuery, Sendgrid and Typeform.
From this feedback we were able to craft a number of hypotheses that we could easily test at scale with new users in the app.