Try to learn more, focus on creative/constructive approaches or outlets (not necessarily artistic in nature, but may be).
Sometimes I'll read into history for something or other and find myself mildly amused and sort of relieved to see how familiar the accounts are. Of course it would be better if they weren't so familiar, but it goes to show they're not anything freshly awful. It's a lot of the same old garbage we've yet to effectively deal with, same as ever, but we have been dealing with it.
In other words, I try to take steps to regain perspective to recognize there's as much, if not at times more, good to experience than bad, and even if I struggle to find much good, I can try to make my own sort of good to keep myself going.