I've recently been watching a series of YouTube videos called "Tales of a Mid-List Author" by Rick Gualtieri, who writes "The Tome of Bill" series amongst others. I've picked up quite a few helpful tidbits, but probably none more so than his entry on Amazon advertising. I've started to run Amazon ads over the last two months, and they've managed to keep a steady trickle of sales going in between promotions - something that hadn't been occurring before.
It is gratifying to see that there are still people out there willing to share their experience to all and sundry. Thanks Rick!