To improve writing you must improve your attitude, in this case, your attitude towards words. They formulate the basis for everything you write.

Use the right word. In order to use the right word, you must have a sizeable word bank. The more words you possess, the more likely you'll choose the right word.

o    Listen and read carefully. You'll be amazed at how many words people use that you don't know. Listen to and read the masters. Jot down unfamiliar words.
o    Collect words. How many vocabulary lists, root lists, and subject specific terms have you been assigned since you were in school? If you're like most students, those crumpled lists ended up in your backpack until two minutes before the quiz and in the trash can two minutes after the quiz. Keep the lists. Learn the words. You won't become a master of words overnight, but you will eventually.
o    Use a thesaurus. A thesaurus will remind you of words you already know. With a thesaurus, you can make your point with less redundancy and keep your writing fresh. Warning--make sure you know what the word means before you use it. Just because it's a synonym doesn't mean it's appropriate. A word's connotation might be offensive when you want diplomacy and vice versa. Imagine, for example, picking your date up on Friday night and telling her father that you have some really fun schemes, or some well thought out intentions or stratagems, when what you meant to say was you had some detailed plans and arrangements for the evening.