My short story collection (around 66K) sells a few copies here and there. It tends to sell to people who liked the other things I wrote, so it's the other way around to what people hope will happen with their shorts.

The novelette (8K) I published only really sold at release and stopped. I took it off sale and will combine it in the next collection. Or write some related stories and publish them as a collection. Based on this, I don't publish anything shorter than a novella as a standalone.

The novella (24K) sells better than my novel. People tend to treat novellas more like novels, so the same sort of rules apply.

My current new short stories either get sold to a market or put on Patreon as rewards for my backers. They'll be combined into a collection at some point. There's really no point in me trying to publish them as separate items.