Welcome to the forum and congratulations on your exam result.
If you can't go abroad, I would try to immerse yourself in the English language as much as possible. In addition to watching TED videos, try to get as much English language TV and radio in as you can. There are plenty of English language radio stations available these days so whenever you're at home without the TV on, have the radio on in the background. Don't actively listen to it, just surround yourself with it all the time. Try to find a native English speaker to meet up with a couple of times a week for conversation. You might find someone there who wants to learn Hungarian so you could do a one-hour meet-up, with half an hour in English and half in Hungarian. You said you read "on a daily basis", but did you mean you just read something in English every day? If so, extend that to everything you read (if at all possible).
Interested in Language