Automated and cheap.
Used many micro drones all connected to each other wirelessly with the central “brain” controlling them and use to dispatch small but effective explosives all at once, directed at specific targets.
Get better attention without asking too much from the subscriber.
Break launch email sequence into many small email messages, one or two sentences each (and maybe an image.) Each should do three things: 1. Be very short and easy to consume. 2. Make sense and build your case for your product (tell a story, give useful information and tips, etc.) 3. Have a cliffhanger, so the subscriber will anticipate the next one.