Greetings! Mr Jayprakash.

In a professional setting where English is required daily to communicate both verbally and in written form there a few helpful tips:

Good spoken English mostly depends on having a useful vocabulary, grammar, and appropriate context. So the first step is to have a good dictionary, a good grammar book ( would suggest Wren & Martin or High School Grammar), and a practice notebook.

Secondly, start reading English newspapers, stories or novels, non-fiction books or any other material. You will start noticing how each word is used in what context, how a sentence is formed, and how a conversation flows. Whenever you have doubts, revert to grammar exercises and dictionary. Record each word in a notebook. That way, you can increase vocabulary and sense the appropriate context and sentence forming, which will help in spoken English.

Thirdly watch English entertainment or news with subtitles on and after a few months again watch them with subtitles off. It will help you sense the way English is spoken and communicated as well as improve your auditory skills which in turn will help you understand another English speaker.

Fourthly, grab a friend, or do it yourself. You need to talk in English daily for at least 15 mins, whether you converse with a friend on simple topics or say simple things to yourself. It does not matter if it is wrong or correct. Just do it. If you want to record it, do so. Then go over the phrases you were hesitating or is mistaken by putting the sentence in a grammar-correcting app or by listening to other contexts. All it depends is on practice.

Best of luck!