you should probably take a break playing online games or play with bots. Analyzing those games will also help. Try practicing puzzles or endgames. Also stop caring so much about your elo. Considering you're a diamond member explore the features and practice accordingly do what works for you!
how to get out of funk


I had the same thing happen to a few weeks ago. I slowed down and realized that I was starting to play the move that "looked" right without actually calculating. I was also snap taking pieces rather than looking for something more valuable.
What the person said above also applies to an extent. Your elo isn't everything and doesn't define you. Just take some time, look over your games. Wait for your opponent to make the first mistake.
going through a rut right now, hit my all time high two days ago then dropped 200 points what should i do