My cousin the magic 8-ball is better at predictions. I’m good at support. My recommendation would be to take a look at the biographies of past secretaries general (bit.ly/un-secretaries) to understand some pathways to that position (e.g., diplomatic service, university professor, foreign affairs ministry, UN Committees, UN employment), and get to work. I fully support you in this endeavor, and look forward to having a friend in high places!