Well, depends on what your going to use thst vocab for.
For example, you can learn about space "Stars, Planets, Aircrafts" - but if you don't enjoy learning about this specific topic...how realistic is someone going to talk about soace with you day to day?
Think about it. What topics do you enjoy talking about? Increase the vocabulary within.
Can you fully describe yourself, everything you own, things you buy, and things you do?
First, focus on vocabulary within a context that is going to be used day to day...and about topics a majority knows about. Then, learn topics that you like to talk about. Then, use more difficuilt words/synoyms ect.
Then, learn another language. :-)