As one other commenter pointed out, one really cannot plagiarize themself, BUT, for example, Medium has rules about duplicating one's own content across the platform. The piece must be sufficiently repurposed to get passed that. I do not think there is a brightline guideline.

Anyway, lots of solid advice here. When I saw the reader interest tag "Listicles with commentary" I thought you would include advice that a listicle should do more than just regurgitate the advice that the writer probably assembled from a google search of a topic, or nowadays by using AI to write it, and all too often plagiarizes. This platform is littered with such trash. A good listicle should at least include personal examples of how the writers have applied the advice themselves. It should share a piece of the writer, noy just instruct. Here's my further thoughts on that if anyone is interested. It's one of my most appreciated by writers essays. https://medium.com/technical-excellence/please-stop-telling-readers-what-to-do-918d7adf128f