1600 is much higher than 1100s because rating gets tougher to gain as you go up (partly due to the math of the rating system, but also partly because higher rated players play better and capitalize on smaller errors).
If you want, we could play some unrated live chess together for learning and I could offer some tailored advice for general improvement 
A few days ago I had 1230 elo but I stagnated and now I'm 1160. Can someone please give me some tips to improve and grew my elo to something like 1600?