Some blogs on Tumblr and people on Twitter are calling on SU fans to take the time to write to Cartoon Network and tell them that they need to treat Steven Universe (or, heck, EVERYTHING that isn't Teen Titans) better. If you have the time, I urge you to take a minute to join in with the rest of us and do so.
This link will send you to CN's official feedback page on their website, if you're in the US:
If you're NOT in the US (like me), that link will just send you to your national version of their site. BUT you can write them by regular mail! Here's the adress:
Cartoon Network Studios
300 N 3rd St
Burbank, CA 91502
USA
And if you take the time to write them, just FOR THE LOVE OF GOD BE POLITE.
Any rudeness will just get your message ignored, guaranteed.
Write about what the show means to you, and if you have examples of how important it is to others, especially children, then add that too, and how saddening the long, mind-boggling hiatuses and lack of reruns are.