The only way to improve vocabulary is to listen more and start reading ... whenever you come across any new word try to use it in 3-4 different sentences and try to repeat for next 2 days
Ma'am Karishma, MashaAllah you are doing well. I appreciate you as you get fluency. I have tried to join you but still not, i have already sent you request on Skype but waiting your confirmation with the name of Sajjad Khan but even then I'm a big fan of you. Pray for your success