I’m stuck

<SIGH>....Broken record time....again.

Stop playing speed chess if you want to not be "stuck"

Dear M1m1c15,

I am a certified, full-time chess coach and International Master, so I have seen it and tried it all.
There are so many ways to get better and I know it can be overwhelming.
You can learn from free videos on youtube, there are books at your disposal that can all help, but they are not tailored to your needs.

One of the most important things you can do is to analyze your games! You must learn from your mistakes! That is a priority. You can't really move on to a new, different topic and learn new ideas if you still make the same mistakes over and over again!

This is where a chess coach comes into the picture. A good coach can show you how to study,  what to study, and give you the material YOU need. Naturally, it takes time to use everything in practice, but you will succeed if you are relentless and persistent!
You should learn the main principles in every area of the game (opening, middlegame, endgame).  Don't focus on only one part! You should improve your tactical vision as well as it is part of all areas!  
This how I built my training program for my students. We discuss more than one topic during a lesson so it's always interesting and they can improve constantly. I give homework too and the right tools to make practicing enjoyable and effective!
Don't worry about your rating and the ups and downs! Just keep on playing and practicing!

I hope this helps.  I wish you good games and 100+ extra ratings

A rating of 500 is a sign of frequent blunders. Always check your intended move is no blunder before you play it.