Learn vocabularies everyday and try to use them in your sentences.
If you have tendency to forget easily like me😅, learn one new word everyday.This will :-
//help you to express your mood language properly. Just like you do in your mother language.
//you won't have to search for words in the middle of conversation with someone.
//make your sentences interesting and attractive.
//help you to speak fluently.
and so on...Start with easy words then go to the hard ones.
Now, if you're thinking about from where you can learn new words, that's not a big deal either.
Read different books which are written in English. You can also explore history, different subjects or topics in the internet written in English. Read and write down the words of which you don't know the meaning or unfamiliar to you.
Newspapers are a huge help in this matter.Write down the new words with their meaning and with an example as well.
Don't try to memorize all of it at once. Rather, read them everyday at least for once and eventually you will learn every word.
<<I will publish a separate chapter only on improving vocabulary giving more explanation>>
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RandomA book for English learning and improving. ^_^