I'd first seek the advice of wealthy industrialists like Elon Musk, Richard Branson, and Bill Gates. Gates especially would be helpful in having effective ways to spend money for the benefit of humanity.
Then (depending on the advice given by others) I'd probably fund NASA, SpaceX, various clean energy companies, disease eradication programs, and development projects for poor countries.
Then (depending on the advice given by others) I'd probably fund NASA, SpaceX, various clean energy companies, disease eradication programs, and development projects for poor countries.