Are there any proven and effective ways to learn a language quickly? I don't have time to study at university.

Look, university is more about getting a speciality. If you need to learn a language, it's not for university either.

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University is really not a place where you can learn a language quickly. To learn a language with purpose and quality, it's better to look for online courses or start with different apps that are available not only for learning English but also other languages https://promova.com/app/german-language-learning-app. This will at least be a good start, after which you can think about finding a tutor or online courses.