I have great respect for Harry Browne, who many you probably have never heard of. Here is a wonderful article about him and some of his ideas from the Misses Institute.
It has gotten fashionable for young people to try and change the world (again) for the better. Of course, every generation has attempted this and a few (like the youth of the late 60s) were so narcissistic about it that we still see the mess they created. Our present crop looks poised to make the latest effort even more flamboyant and destructive.
Harry revoiced the answer to this in the 1970s. This is a concept that actually features in the Bible, so it has the cache of being tried a few times before. If you want to make the world a better place, be a better person!
Isn't it simple? If the world is crashing down (it always is) and everything good is coming to an end (yet again), the best thing you can do to make a positive change is make yourself into the change you want to see. That should take your whole life and then some, so you should never get too weird about changing anyone or anything else - you have plenty of work on your hands already!
I know - everyone else is the problem and if you can just pass the right legislation or shame the right people, everyone will fall into line and your life will work better. I didn't mistype that - most of the screaming and violence is all about making life work better for the people who are screaming and breaking things (usually at the expense of the very people they swear they are helping)! It has nothing to do with anyone else (in a positive way), no matter how loudly they say that it does. This is a manifestation of the concept that all of a person's problems are someone else's fault. My kids tried this stunt (typically when they were young) and I will give you the answer that I gave them: So What?
No matter how or by whom you think your life fell apart, no one can really fix that at this point except you. The first part of any solution is (of course) to stop blaming other people or circumstances and just get busy improving things. You will usually get a lot of help from nice people unless you choose to drive most of them away by getting indignant and angry about things. (I have lots of personal knowledge about this.)
Do you think the world needs improvement? Improve yourself and you will develop more influence to change others, mostly by inspiring them to make similar improvements to themselves. So, quit complaining and get to work on the one thing you can influence today: yourself.