Looking for a real project to work on for free

I am looking to work on a real-world project, as I am tired of doing Udemy courses and creating projects that don’t reflect reality. I am open to working on full-stack projects using JavaScript, Dart/Flutter, Python, or even C/C++. I have extensive experience with Python and want to deepen my knowledge in software engineering. My goal is to learn quickly, develop practical skills, and add meaningful projects to my portfolio. I am available to dedicate around 10 hours per week and work very independently. I only ask for the support of an experienced mentor for weekly guidance, with a meeting to align progress and clarify questions.