that's a tough spot to overcome for sure
Get Good

How do I get better. I am 800 now, but I want around 1100 by the end of the year. What should I do?
I think the best advice is to slow down. Do puzzles and play games, but take at least 1 minute per puzzle, and play 10 minute games. Chess is pattern recognition, so give your brain time to really learn and understand the pattern! Then you can get faster.

Im free if anyone wants to play me in a daily game or just friend me. I also have a Youtube Channel "JV63Chess" if you want to sub!
Keep growing in chess!
Peace ~

I also recommend trying out different openings and also understanding different tactics and how to attack and defend a king
300 points of rating in one year is a high goal. I would say to learn one or two solid openings for both white and black. Learn mid and end game as well. I also recommend playing at least 5 daily games and 10-20 other games a week.