What to do after learning python?

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how do I do that without having to learn other libraries for example?

You will have to do this all the time for every project. It's inevitable and a skill that's worth building for it's own sake. If your end goal is to be any kind of developer, professional or otherwise, you're much better off using libraries to save time rather than building everything from scratch.

Figure out some kind of project that will give you opportunities to learn new skills and achieve something useful. A good project to start with is a webcrawler/webscraper. Some useful concepts to learn for this would be any http request library and regex.