It's a bit of effort to go to each place, but it does drive a good set of initial users. Some of it becomes evergreen, but most of it (e.g. Slack channel post to a niche group) gets lost within a few days.
The following is not intended to be an ad, but I created a series of scripts that essentially created a large repository of AI-generated blogs/articles related to each one of my products and published them to a CMS. On average, these alone drive between 100-1000 organic clicks per day.
Then I turned this script into a product that less-technical founders/SMEs can use for their own website: https://www.typeup.ai/ It's not a product that makes me rich, but helps keep the lights on.
You can also build this yourself with clever daisy-chaining of code/no-code solutions as long as you're comfortable with API calls, prompting, and scripting.
OpenAI is a good start for generating blogs, but I recommend experimenting with the other models as well as the open source ones to get the right writing style and output that best fits your CMS.
Despite search engines saying they'll de-rank AI generated content, it has not impacted traffic at all. Probably too large scale of a problem to handle for the time being.