The final thing to really work on is grammar, and spelling and punctuation with it. Reading will help a great deal in this respect, as you can learn from seeing it used properly. There are also plenty of websites and books available to help with grammar and punctuation if you’re unsure of how to use something. Improving your grammar is so important because spellcheckers still aren’t advanced enough to pick up most errors, or even incorrectly tell us to change something. Pronunciation and vocabulary must be improved though too, as all are equally important and all affect your grasp of the English language.