Most cold email advice is about wording. Wording matters far less than whether the message reached a person who could act on it.
1. Send to a person, not a queue
A named recipient with a job title outperforms a shared inbox by a wide margin, because somebody owns the reply.
2. Get the territory right
A postal address in the list means you can filter to the region you actually serve. Half of all "low reply rate" problems are really "wrong country" problems.
3. Warm the domain before the volume
Reputation is earned slowly and lost fast. Split by provider and ramp each one rather than starting at full volume.
4. Say something only they would recognise
One concrete detail about their business beats three paragraphs of positioning. This is why the quality of the data matters more than the quality of the template.
5. Make the reply cheap
One question, answerable in a sentence. Every additional ask reduces the chance of any answer at all.