[Question] Global tax and global government institution to redistribute the money for the most good—achievable?

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I am currently thinking a lot about the following problem:
In theory, we have enough resources to fullfill the basic needs of every human being. However, (increasing) inequality leads to different access to resources, power concentration and social instability. Governments often act in favour of the richest due to the power those have with their money and the fear of encouraging them to move to another country and loosing tax income. A global institution taxing the richest 10% (with an e.g. exponential rise to the richest of the rich) could counter this.

My vision would be to use this money to:
1) establish a (low) global basic income in order to encounter the worst poverty
2) establish an institution (or find a way to transform the existing structures of the United Nations) that monitors the status of humanity in all regions of the world (e.g. following the UN development goals plus a devision to tackle existential risks), evaluating approaches and giving concrete advices how to improve in the most effective way and stepping in when governments fail or are not able to solve the issues. I have some more detailed ideas about the structure, but I am sure there are 1) bright minds out there who are deeper into the topic and perhaps have great suggestions that I don’t want to bias right now 2) it is pointless to discuss details if there lacks the plan how to achieve the overall goal to establish such a “people’s institution” that advocates for the majority of humanity on a global level against the existing structures of power.

So my question is: Are there legal ways that doesn’t mean that those who currently hold money and power have to establish it? Because it seems unlikely to me that existing governments agree to establish such a loss of power, even though it is kind of an insurance for them that another player (be it a government or a person) is developing a technology (AI!) that leads to a total concentration of power through money, as the global tax would counter the money concentration to a certain degree (yet to be defined in detail).
And if yes: What would it take to follow the path? Is there a possibility to file a lawsuit at the international court for global governance failure/​failure of protecting human rights/​failure to provide assistance (thinking in the latter case of Singer’s comparison not to help a drowning person when you pass by vs letting someone starve at the other end of the world despite having the ressources to prevent the death)?
Or would it need a vote of the people of the world?
Or is there a (peaceful) other opportunity I don’t think of?
As I am not a lawyer, I am a bit clueless how one could proceed with that. Anybody here who can help out? Because if we could really work out a way to systematically redistribute wealth for the greater good, this would save countless lifes—in the present and the future.

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