Study words by theme: 1. Pick a topic (example: doctor's office). 2. Look up words related to that topic. (example: examination, stethoscope, prescription, nurse). Alternatively, you can read an article about a topic and pull words you don't know from that article. 3. Make a word list. Hand writing is better than typing because it forces your brain to focus on the word a little more. 4. Write a story using the words. 5. If you have a conversation partner, schedule a meeting with them to talk about the topic. 6. Repeat with another topic.

This is a very one-sided question. What methods have you tried? What do you think?

To start with, use a reliable dictionary then choose 5 words per day, look at the examples given in the dictionary so you can learn them with context, after that listen to its pronunciation and write a sentence per word.