First, realize that humans are bad about taking good things for granted and only focusing on the negative. The first part of this is a good description of that:

https://saltyoldgal.blogspot.com/p/prevention-is-hard-to-mea...

So, actively look for good news. There is good news out there, for example:

In 1986, there were an estimated 3.5 million cases of Guinea worm in 20 endemic nations in Asia and Africa.[3] Ghana alone reported 180,000 cases in 1989. The number of cases has since been reduced by more than 99.999% to 22 in 2015

https://en.wikipedia.org/wiki/Eradication_of_dracunculiasis

Try to make things a little better in your little world. Try to be helpful and do good and yadda.

Also, make sure to take care of yourself. If you are hungry, tired, sick, broke, etc. the world tends to look pretty bleak.