It is necessary for you to keep trying to increase your English skills. The reason is because by increasing your English skills you will get to do many things around the world. For example, if you are able to increase your English skills to the pre-intermediate level which is the B1 level and prove it by taking the B1 test through websites like britishlifeskills.com, you will get to have the permit to stay in the UK for a while or even live there for the rest of your life by changing your nationality.
There are many things that you can do to increase your English skills. One of the ways in which you can learn English language effectively is by finding a partner and practicing to do a job interview or a presentation in English. This activity will give you the opportunity to sell yourself in English. You can share the experience, education, strengths, weaknesses, targets and your career path. By having the upper intermediate level, you have the potential to work in an English environment, so this exercise will feel as real as possible.