Think through the state of the world and the consequences of those things. Unless you're also invincible you will be killed for doing literally any of those things.

Lets just do world hunger. We produce around 2.5x the amount of food needed to feed everyone to the average american caloric intake. That's something we already do. We have the ability to ship any good anywhere in the world within 12 hours, or alternatively, keep a good fresh enough to be sold over MONTHS of transportation (think the fresh fruits picked in South America that is shipped to Thailand to be processed and shipped to china to be packaged then shipped to the US to be sold 3-6 months after they were picked.).

We have no world hunger. There is not a lack of food. There is not a lack of transportation.

Hunger is used as a weapon. Period. That is the totality of the reason that any single person or group of people do not have the ability eat 3 square meals a day.

If you, as (presumably) an American were to just bring food to Cuba, you will be investigated by congress and Trump's DOJ both on criminal charges. (see Hasan Piker currently being subpeanoaed for just filming Cubans and bringing food.)

If you magically could produce infinite food, you have just taken away the most used weapon in world history. This means you are the single most hated and despised person by not only those in power, by but everyone that benefits from those in power, and that's a lot of people, and they own (effectively) all the guns and nukes.

The reason people dream small with superpowers is because, realistically, as long as you don't drastically change the status quo, you're safe.