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The hobby projects don't have to be large or advanced to be useful. Even small command-line scripts or browser extensions can get you started. As I learn more, I usually revisit my projects to add more features or improve what is there already. For example, I created a browser extension called YAHE to port a browser feature I wanted to use in Chrome. While it's functionally not very different from the original version I made, I've edited its structure a lot over the years to be easier to maintain as I've learned new techniques and practices.
Linters: Tools for finding and pointing out potentially problematic code, and suggesting how it could be made better. Some of the tools can also automatically fix the problematic code. For example, JavaScript has ESLint and Shell scripts have ShellCheck.
Auto-formatters: Tools for automatically rearranging the code formatting to follow a consistent style without changing what the code does. For example, Go has go fmt and Python has black.
I've heard a lot of people say that one of the best ways to learn to be better at coding is to learn how other people write code. For example, some suggest browsing through the codebases of popular open-source applications such as SQLite or etcd.
Many desktop apps such as Discord and Visual Studio Code are built with JavaScript.