Since the first lines of your linked site mention SOLID and design patterns, you’re already onto the right stuff there. That’s the framework side of things. Beyond that, I advise you to go study the advanced features of your preferred language so you know how to code “correctly” and idiomatically in that language (although not in a way that obscures intent). Then it’s perhaps a mental hurdle to open your repos and know that all code has imperfections. Opening it may indeed help to improve it - code review is arguably the single most useful practice in code quality.
Since the first lines of your linked site mention SOLID and design patterns, you’re already onto the right stuff there. That’s the framework side of things. Beyond that, I advise you to go study the advanced features of your preferred language so you know how to code “correctly” and idiomatically in that language (although not in a way that obscures intent). Then it’s perhaps a mental hurdle to open your repos and know that all code has imperfections. Opening it may indeed help to improve it - code review is arguably the single most useful practice in code quality.