Consider all the actions possible tomorrow, which individuals or groups could take. Are there any which would "obviously" (meaning: you believe it with high probability, and you expect that belief to be uncontroversial) result in decreased x-risk?
(For example, consider reducing the size of Russia and the US's nuclear stockpiles. I'm curious if this is on the list.)
(I include "which individuals or groups" could take because I am interested in what actions we could take if we all coordinated perfectly. For example, neither Russia nor the US can unilaterally reduce both their stockpiles, and perhaps it would increase x-risk for one of them to lower only theirs, but the group consisting of US and Russia's government could theoretically agree to lower both stockpiles.)
I've previously read a study that suggested evaluation during brainstorming led to less ideas - I don't remember where. Personally, I feel less inclined to post when I know someone will tell me my idea is wrong.
Edit: A Harvard Business Review article about brainstorming and 'evaluation anxiety' led me to this article, which I have not been able to read yet.
https://hbr.org/2015/03/why-group-brainstorming-is-a-waste-of-time
https://onlinelibrary.wiley.com/doi/abs/10.1111/1467-8616.00154