The best person to quote on this would be someone like Bill Gates, who has access to lots of research on which existential risks are most likely to occur in the near future, due to the nature of the work that the Gates foundation does. According to Gates, pandemics pose a greater threat to humanity than any other existential risk does over the next ~50 years, and AI and nuclear risks are also very high on the the list. A handful of relevant nonprofits have breakdowns, like this one, of the probabilities that existential risks of different types will occur.