Public advocacy seems likely to be the best thing on the margin to prevent extinction.
Technical alignment research is (a) less neglected and (b) unlikely to solve alignment in time.
Well-done advocacy directed at policymakers is possibly better, but it's unclear what efforts are most useful, and it's less neglected.
PauseAI is the only game in town for public advocacy. At this point I think it's too early to say if they're doing a good job, but I think it's a good EV bet.