Start from what your viewer wants
Edits: tell me Day 1 + the second (e.g. "Day 1, 0:12: …").
The phone-size test
Square 1:1 version (feed)
Edits: tell me Day 2 + the second (e.g. "Day 2, 0:12: …").
Skip the thumbnail question, show the thing
Square 1:1 version (feed)
Edits: tell me Day 3 + the second (e.g. "Day 3, 0:12: …").
Nobody knows me yet
Edits: tell me Day 4 + the second (e.g. "Day 4, 0:12: …").
Add tension, not tricks (before → after)
Square 1:1 version (feed)
Edits: tell me Day 5 + the second (e.g. "Day 5, 0:12: …").
Coaches, count sign-ups, not views
Edits: tell me Day 6 + the second (e.g. "Day 6, 0:12: …").
One subject, four videos
Square 1:1 version (feed)
Edits: tell me Day 7 + the second (e.g. "Day 7, 0:12: …").