Remove raceism. That would handle most hate and solve the worst problems of religion... it would change attitudes on 100 subtle things that people claim not to be racist but are.

Turn the dials for empathy, moral courage and love up a couple of notches.

Incarcerate Donald Trump.

I think the most fundamental thing I could do for the human race if I had a magic button I could press to fix just one thing, it would be to make people skeptics and critical thinkers by default, without any particular need to cultivate it in themselves or to work against what we currently default to, which is rampant confirmation bias.

On a selfish level I would like to intuitively have an excellent grasp of WTF other people are thinking, particularly the women in my life, without having to do a forensic investigation to tease it out of them.

Increase spending and focus on education. There's not one problem that I can't trace back to ignorance. Liars in power are one thing, but dumb fucks backing and believing them really piss me off.

End Islam.

Eliminate religion

Make everyone aware that we're all in this together on this planet.

Put more priority onto mental health care

No religion... A completely secular world

There are so many things but I think that I would start by trying to find a way to help everybody understand that we all do the best that we can with our genetic makeup and the environment that we are born into and over which we had absolutely no control.

Rid it of humans.

Get everyone to think for themselves and ask questions.

Remove the criminal violence-performing psychopaths that control the Military Industrial Complex and use it it to run the Western World.

There was a similar question a while back but my answer is still the same.
A better educational system.

Eradicate that fucking greed, greed has made our society disgusting. We care more about money than people...

I think most of the problems start with religion.

Get rid of Republicans.

If I had that kind of power I would eliminate "GREED".

My response to this is based on Humans as a central theme. Humans and how we deal with each other. In that context, I would eliminate religion and nationalism from the human condition. This would result in less conflict, less manipulation, more cooperation.

Dramatically reduce the population of humans

I would love to get rid of racism. It's still an issue.
Thanks to Trump he's out to single out anyone that's brown.

I would simply remove the ability for people to feel hatred toward each other (and any other living things). The world would still be just as complicated and problematic - but how nice if all the responses would stop just short of hating someone - or something. ????

Remove disease. That's tough because the reality is that we all must die but if we could just age slower, reproduce less, and stop pollution we might be able to save human kind but not at this rate. I just wonder how many generations are left before greed takes us all.

Subject religious and political organizations to taxation of all titled property and confiscatory taxes on all revenue not spent on the exact solicited purposes.