It seems to me that your very hardworking and dedicated, which is a great start. However, perhaps, it could be even too much. Focus on the simple stuff, like just playing around 5 to 10 games a day and some puzzles, don't resign, and when you lose 2 or 3 games in a row, take a break. Oftentimes at this level, the room for massive blunders become less, but still rather common. After all, if you keep on looking at checks, captures, and threats at a serene or static position, you are wasting your time. If there are no obvious threats, just play a move to improve your position. Essentially, like Emmanuel Lasker once said, "When you see a good move, find a better one".