Hello Aspirant
The best way to improve your English is to practice. Don't hesitate and think that you may speak the wrong way or your grammar may be wrong. Don't let your mind go there, be free spirited and speak in English. You can even start thinking in English, this is the best way and it has worked for me wonders.
Other ways-

Read novels, newspapers, short stories, poems. But this needs to be regular, you cannot start a thing and leave it in between. Be consistent!
When you are reading something, underline and find the meaning of words that are difficult for you. Do not leave them as it is, curiousity is the key.
Listen to English songs and watch Hollywood movies with their subtitles on. This will help with your fluency in speaking.
Try to find someone who is willing to have conversations with you in English. Speaking it out loud is very important.
If possible, try to write something in English - it could be about yourself, your day, your life, your family, anything! Just write something. Don't just focus on speaking, writing is equally important.
You can try Duolingo, it's an app that helps you learn language hastle free.

Hope all these methods help. All the best