My approach to this is:
- Stop watching the news, or paying attention to politics. You have almost certainly no control over anything they are reporting and almost none of it affects you in any way. I didn't pay any attention to the presidential race, for example. None of it was going to change my vote. I didn't watch the election night coverage; I watched a ball game and went to bed. I figured I'd hear the outcome the next day, I had zero control over it anyway so why stress about it?
- Cut down on social media. It's unnatural and unhealthy. Do more stuff that requires face-to-face interactions with people. Use social media as a communications tool to set this stuff up, but don't follow celebrities or people you don't know personally. Turn off all alerts that are not from your personal contacts. Don't like or forward memes. Try going places without your phone, to build up comfort at being without it or not constantly checking it. You know that until 15-20 years ago almost nobody had a phone when they were away from home.