How can I improve to 1400 and keep it?
You're sad, because this is the best you got? Yeah obviously this is what you accomplished right now, I have no idea if you can better or not
Blunder check before you move.Analyse your lost games to learn from your mistakes.
Are you illiterate? No, you can read Winning Chess Series by GM Seirawan.
How can I improve to 1400 and keep it?