You do not need to complete specialized courses or study advanced vocabulary to advance to advanced English. It is important not to expand your vocabulary and increase its complexity. You should work on the formation of skills, perceive and understand new words, apply them in practice. A high level does not mean perfect grammar and pronunciation: even with gaps in knowledge, you can learn to communicate and understand the language well.
You should definitely decide what you need the language for. Focusing on the end result will allow you to quickly achieve your goals. You don't have to do a lot of grammar exercises every day - do only tasks that are useful and interesting to you to keep you interested. The development of the quality and volume of thinking will change the attitude towards the development of speech!
Good knowledge of English opens up many opportunities in various areas of life:
Finding an interesting and highly paid job with a high level is much easier than with basic knowledge.
Expanding the circle of communication
Reaching a high level is a great opportunity to meet new people around the world.
Reading professional literature
The advanced level will allow you to read specific literature in its original form, which will allow you to be the first to use the chips of foreign companies.
Broadening your horizons
The ability to study information on the Internet in English will greatly expand the horizons, since there is much more such information there than in Russian.
The high level does not limit the possibilities for watching TV series and films of any subject.
These are the most common reasons for the need to continue learning English. The advanced level does not mean working with complex content, but free communication on almost any topic, a good understanding of the speech of native speakers by ear, the ability to use a variety of synonyms and express your own point of view.