Today, I prefer to chat something about habits. Today, I prefer to chat about habits.

Today, I'd prefer to chat somethingtalk a bit about habits. Today, I'd prefer to talk a bit about habits.

Last night, I scrolled my phone for 3 hours, because I canould not stop watching short videos. Last night, I scrolled my phone for 3 hours, because I could not stop watching short videos.

(1) You're writing about the past, so the past tense might be more appropriate. In this particular case, howevever, the present tense is also acceptable, if you not being able to stop scrolling is a general fact. (2) By the way, "cannot" is more commonly spelt as one word. "Can not" might have a different nuance.

Last night, I scrolled my phone for 3 hours, because I can no't stop watching short videos. Last night, I scrolled my phone for 3 hours because I can't stop watching short videos.

ThaIt was terrible! It was terrible!

"That" sounds a little awkward here.

I think it wasted so manyuch times that I can us which I could have spent doing something more productive. I think it wasted so much time which I could have spent doing something more productive.

(1) Mind the tense; you're writing about the past. (2) In this context, "time" is an uncountable noun, so we use "much" instead of "many". For the same reason, we do not use "times" here.

I think itI wasted so manyuch times that I canould've used. I think I wasted so much time that I could've used.

I feel my brain controls my body as sayingby telling me to "keep slipping, boy"." I feel my brain controls my body by telling me to "keep slipping, boy."

I changed parts of the sentence so that it sounds more natural.

I feelt my brain controlsling my body as sayingit said, "kKeep slipping, boy"." I felt my brain controlling my body as it said, "Keep slipping, boy."

What can I do to kill this bad habit.? What can I do to kill this bad habit?

What can I do to kill this bad habit.? What can I do to kill this bad habit?

Do you have any recommendation for me.? Do you have any recommendation for me?

"Recommend" is a verb. "Recommendations" is the noun.

Do you have any recommendations for me.? Do you have any recommendations for me?

jJust leave it underin the feedback square. Just leave it in the feedback square.

We write inside the feedback square, not under it.

If you do, Iit would be happy with that allmake my day! If you do, it would make my day!

"Make (someone's) day" is a set phrase that perfectly fits what you mean to convey. It means to make someone happy for the entire day.