Hello, We just launched a blog, hosted on Square space, the platform doesn’t offer RSS (maybe no one does these days), so our participants don’t get notified of new posts. Are there any other platforms, such as Medium, Substack, or anything else that would allow following and generate broader reach for the posts?

I know Medium provides cross-post reach for some of their posts. Substack does this for the top blogs. Overall I wouldn't rely on those platforms but would go for a long-term play of getting SEO traffic from Google.

Thanks - You mean getting SEO traffic directly to the original blog?

yup