I just finished Codecademy's C++ course, where do I go now?

So I recently finished Codecademy’s C++ course and I don’t really know what to do now. I have a pretty good experience with Python but I don’t really feel like re-doing all the projects I did while learning Python in C++. I think I have a good understanding of programming basics and fundamentals. With Python I felt like I had so many resources that were easily available, but I can’t really find anything like it with C++. I eventually want to start developing cross platform GUI apps. Are there any good resources for beginner/intermediate C++? Also, any modern looking GUI frameworks (maybe something like what’s possible with Electron.js) for when I do make apps? Thanks!