Nikujaga and...

October 6th and 7th
It's gotten cold recently.

Yesterday I cooked Nikujaga. It's a popular Japanese pot dish. I often cook it because it's not so difficult to cook.
My mom and I ate it with miso-soup and rice for dinner. I think I did a good job!

Today I had a mistake for made a mistake at my job. I am reflecting back on things. So I should be a professional. I fully realized that again. Well, I'll do my best from tomorrow again.  I'm reflecting on what I did so I don't make the same mistake again.  I want to be a professional and will do my best from now on.

(I understood everything you wrote and only made corrections to make it sound less formal.  Overall you did very well.  Keep up the good work.   I am not a teacher so you should look for other feedback. :-)