how to be a better programmer

If you want to become a better programmer then stop thinking in code. Programming is ultimately about solving problems with a predetermined set of abstractions. How these abstractions are expressed syntactically is irrelevant. So you should be practicing how to glue abstractions together instead of chasing the latest idioms and design patterns and incorporating them into your latest framework. This is why lisp programmers, and functional programmers in general, are better programmers. Functional languages force you to practice thinking with abstractions instead of low-level details and so over time functional programmers become better problem solvers because every time they sit down to program they are practicing better mental habits.