My thriller novel launched two months ago with decent initial sales (about 300 copies in the first two weeks), but it's fallen off a cliff since then. I'm averaging 1-2 sales per day now, and I'm wondering if it's worth investing in book marketing services to revive it.

I did the usual launch activities—emails to my small list, posts on my social media, a few friends sharing it—but I didn't have a sustained plan beyond release day. Now I'm looking at options to give it a second push.

I've received offers from several book marketing services ranging from $500-1,200 for revival campaigns. Has anyone had success with post-launch marketing pushes? Is it possible to breathe new life into a book that's lost momentum, or should I just focus on my next release?
Specifically interested in hearing about experiences with:

BookBub featured deals (if anyone's been accepted!)
Amazon Advertising campaigns for older titles
Email newsletter promotion services
Social media advertising for books beyond their initial release

My budget is around $800 maximum. I'm particularly interested in marketing approaches specific to thriller/suspense genres that might help me reach new readers who'd enjoy my book but haven't discovered it yet. Any advice from authors who've successfully navigated the post-launch slump would be really appreciated!

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