If you could speak 100% perfect English, you should have the less chances in the job market. Only the native English speakers dare to claim for the perfection, there are billions of people on earth, the chances is billions to one. In response to your question, I would like to go online, aswer Italki questions for free.

I would listen to American pop songs and understand them :)

I would be create tutorials about fractals, and design and write books about my country and history, though I would be work in a big design's company abroad, also... And of course it had better to speak fluenlty

i d go to an audience with the queen of england and tell her about the english spoken in the streets.

I would read English classics.