If we, or all nations, want to come together, our first step is to recognize the importance of the United Nations. If we are able to understand that the United Nations can be an apolitical checks and balance to all countries, it may be a major step forward.
An ideal theory is that all countries begin living by the United Nations Universal Declaration of Human Rights[1]. Incorporate this into the foundation of your countries government and it sets a tone and example for which type of moral values you prioritize within your borders.
[1]: https://www.un.org/en/universal-declaration-human-rights/ind...