I've learned a lot from the "Make a Lisp" project. If you haven't seen it, I'm sure you will enjoy studying it. https://github.com/kanaka/mal
I plan to do it, I also saw interesting projects like implementing a compiler in Lisp, on `build-your-own-x` repo : https://github.com/codecrafters-io/build-your-own-x
I've learned a lot from the "Make a Lisp" project. If you haven't seen it, I'm sure you will enjoy studying it. https://github.com/kanaka/mal