Hi there.
Two months ago, I published a short article on Cause Prioritisation aimed at a general audience. The article covers a basic explanation of the field and how it appears to differ from Effective Altruism, as well as some common objections I've heard. It is quite cursory, and I am not an expert, but I hope it might still be useful for some people.
https://medium.com/@Olafvanderveen/making-informed-decisions-the-value-of-cause-prioritisation-46ee80fcff27
Hey there, I'm a bit surprised you didn't mention some of the existing introductions to this topic including:
1. CEA's introduction to EA, which includes a section on choosing a cause:
https://www.effectivealtruism.org/articles/introduction-to-effective-altruism/
And more in-depth articles within the handbook, such as:
https://www.effectivealtruism.org/articles/prospecting-for-gold-owen-cotton-barratt/
2. The chapter on this topic in Doing Good Better
3. Some of GiveWell and Open Phil's relevant posts, such as:
https://blog.givewell.org/2012/05/02/strategic-cause-selection/
4. 80k's introduction and video as well as other relevant articles:
https://80000hours.org/career-guide/most-pressing-problems/
https://www.youtube.com/watch?v=1xsR0XBwyo4
https://80000hours.org/problem-profiles/
https://80000hours.org/career-guide/world-problems/