Sales have stopped

Ok, so I’ve been selling for a year now. I’ve seen the ebbs and flows, but my niche product is not seasonal and averages about the same number of sales a month.

We had one of our best months in August and finished super strong. But now in September it’s like sales have ceased. Literally they have fallen 100% since this time last year and I’ve never seen this.

Is anyone else having issues with this? I’ve looked at ads, I’ve looked at organic sales, I’ve added in more keywords. Not sure what’s going on.