There is actually a great website that I use often. thefreedictionary.com. If you spend a few minutes there a day it will improve your vocab. They have quizzes, new word of the day, and lots more.
When you see an interesting word that you appreciate, add it to “my word list”. You can then go them over every so often and your vocab will grow. Another thing is that you should customize the page to your liking. You can knock out boxes that you know you wont be using in future visits so your page isn’t clogged. You’ll understand when you check out the website.
I highly recommend this site to everyone out there. Check it out.