The topics you like or that you need to talk about for work/travel etc. will form the vast majority of your conversations.

There are topics you couldn't speak about even in your own language.

Learn all of the vocabulary and relevant phrase you need for these common conversations. Then put them into practice. Seek out opportunities to practice these kinds of conversations as much as possible.

Every mistake is an opportunity to learn. If you don't make the mistake, you miss out on that opportunity.

Reading Game of Thrones or watching period dramas is all good and well, but this is not the kind of language you hear in real life.

Focus on the kind of conversations you're likely to have and use the kind of words that native speakers use in these situations.

Resources like youtube are very useful for this because you can watch short videos made by native speakers using everyday language and slang.

Listening is important for fluency because it helps you internalise the sounds and structures of the language.

Don't just listen randomly. When you listen, pay carefully attention to what you're hearing and concentrate on taking it in. The brain remembers things when we bring attention to them. Without some form of attention, learning can't happen.

You pick things up be hearing others saying them and then copying them. If you live or work in an English-speaking country, for example, you'll soon pick up and start to use the same phrases you hear your friends colleagues and neighbours saying.

Surround yourself with the language. This helps create repetition. It also helps you do adapt to the sounds and flow of English. Fluency isn't just about what you say, but how you say it.