The first thing i'd do is I would ban war, because it is very tragic, because war affects not only the participants of the war, but also civilization, I wish there was peace everywhere.
I would also like to completely remove all crime and banditry, for this it would be necessary to join the ranks of police and other services fighting against crime.
The next thing i'd do is help homeless people and homeless animals. I would build many shelters in every country, many veterinary stations and many volunteer services to help homeless people and animals.
There are some less serious things i'd do to - this is for example to introduce or eliminate some laws, but it is not so important.
Finally, I'd would create many vaccines and drugs against various diseases.
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