nostr:npub10d5zhp5atut9hcmyyslxdr07s65tj45q72wxvg229ajwjvmpqugq6lvvxa soft promo seems to be the go, especially on social media. I see a few people have mentioned prompts like this one as part of their marketing approach. I find this more enjoyable and have bought 2 books via prompts this month (prompts with 4 questions on the same tag in an hour so someone would say something that hooked me twice and the second time I knew I had to buy it), so it can work.