How can I efficiently motivate myself to study vocabulary? I don't seem to ever find the will to memorize words and the length of it makes me give up easily. Any tips?

Reading is the best option to groom yourself in vocabulary... Read the best novels. You will definitely come across many new words while reading. You don't need to remember the meaning of a word. Coz once if you know the meaning, the words will be repeated again in novels. You will be automatically remembered whenever you see that word. Make use of those words in your real life. It is the one step for improving yourself. Imagine for a minute what you would feel like if you were in a foreign country where you did not know the language. You would not be able to understand what people were saying to you, and they would not understand what you were saying to them. That is extreme, where there is no understanding of the words. The less vocabulary you are familiar with, the closer you get to that extreme.