Most pitches are not answered on the first send, and almost never because the answer is no. Inboxes are buried and DM requests are ignored for weeks at a time. The follow-up is where first deals actually come from.
The cadence
Around day four, one short bump. Friendly, assuming the best, no new pressure. "Just floating this back up — still happy to put that idea together if it is useful." If you pitched by DM, this is the message that says you emailed too, in case DMs get buried. That reads as organised. A third DM reads as pushy.
A week later, one more. Then stop. After two follow-ups, leave it and move on. A brand that goes quiet can still reply to a new idea months later, so leaving well matters.
Make each one carry something
Do not resend the same message in different words. Give the new message a reason to exist: a clip you have filmed since, a second idea for a different product, or the switch from DM to email.
That is all there is to the technique. The hard part is not the wording — it is remembering. A pitch you cannot see is a pitch you forget to follow up, and the follow-up was the part that worked.
So the only real trick is keeping the sends where you can see them, with the follow-up showing up as something due when it's time, rather than something you meant to do. Marking a brand as sent starts that clock for you.
See who's due and send today's bumps.