What happend to me?

I am a native korean speaker and learning eng and spanish. Last night I was reading some reddit posts and at some point my voice started vocal frying. After that my english speaking improved so much. I dont know what happned but it feels like my mouth, tongue, throat, jaw, they forces me to speak english correctly, effortlessly and naturally without trying.

Before that happend I used to be stuck when speaking english while trying to pronounce correctly also, speaking english was so uncomfortable and unnatural for me. After that, all changed. The way I speak changed. My voice became much deeper. It just suddenly happned and I don't understand what is it and why it happend.

I've never experienced it before. It feels weird when I speak. I feel like I speak like a native speaker. It's so natural and smooth. But the more strange thing is when I speak korean it feels different. I really recognize diffrences my mom doesn't tho. My voice became deeper and the way I make sounds was changed even when I speak korean. Sorry for my messy writing. I'm not good at english. Have you heard about that phenomenon? What is it called? What it is?