1) Learn a new word every day
You can make use of a vocabulary book for structured learning. Alternatively, some apps are really helpful too.
2) Read and write on a range of topics
Let your reading diet include various genres. Do create various types of writing too. As you read and learn new words, apply them in your writing.
3) Listen to and speak with new words
Listen to songs, to news broadcasts, recordings, etc. and pick up new vocabulary that you have heard. As far as possible, use the new words in your speech too.
4) Look up the meaning of new words
You should use the dictionary or thesaurus to look up the meanings of words as soon as you can. You can also make use of convenient online dictionary/thesaurus or apps to enrich your vocabulary. Keep a record of the new words and revise until you are familiar with them.
5) Look for the contextual meaning of new words
When you encounter a new word, try to infer its meaning from the context of the passage.
6) Revise vocabulary based on topics or themes
When words are categorized in topics or themes, it is easier to understand and commit to memory.
7) Keep a Vocabulary Bank
You can keep a record new words learn in a notebook or electronically. Whichever mode you choose, just make sure that this record is easily accessible for revision.
8) Review vocabulary
Review is important in vocabulary acquisition. You should frequently refresh your memory of new words by looking at your word lists or vocabulary bank.
Take a look at this Word Study Organizer which is helpful with the learning of new words!