***** NOT A TEACHER *****
Hello,
From personal experience, I have learned that there is only one way to build up your vocabulary:
Read - Read - Read !!!
*****
Thanks to the Web, you can easily read the best magazines and newspapers in the world.
If you want to improve your vocabulary, you might try Britain's London Review of Books. Believe me: when you read an article
in that magazine, you will be using your dictionary very frequently.
For a very good American magazine, do please check out The New Yorker. The English is superb.
*****
You say that you wish to speak to professional people. I do not know what field you are in. But I am sure that the
Web has magazines in your field. Read them regularly, and your vocabulary will grow quickly.
James
P.S. In my first paragraph, I used three exclamation marks. Please remember that many teachers want students to use
only one exclamation mark. I feel, however, that exclamation marks are a matter of style, not grammar. So I have
chosen to break any so-called "one exclamation" rule. But I suggest that you follow the teachers' advice about using
only one exclamation mark!