I've been programming since my teens and professionally for 15-odd years. I think programming really only "clicked" in the last few years. Now I know with reaso

I've been programming since my teens and professionally for 15-odd years. I think programming really only "clicked" in the last few years. Now I know with reasonable certainty how I will structure a project and how much time it will take. What made it click? There wasn't a specific point, but I think it was when I started to seriously branch out into multiple languages. I've dabbled in other languages before, but when I seriously started working with other languages and made larger projects in them did I understand how to structre the code so it's not terrible.