Writing Feedback / Day-by-day people's lives are becoming increasingly stressful. What is the reason and how to solve [3]

The solution for 2nd cause is too short, you should explain or give example more.

Writing Feedback / IELTS WRITING TASK 2 - FRIENDS WITH PEOPLE WITH SAME OPINION OR NOT [4]

Associate --> making friends with/ associating
open minded person --> open-minded people (should rarely use person, this is often used in legislation document)
So, which one you prefer? --> should not include a question in Ielts essay. If you still want, correct it as "So, which one do you prefer?" (lack of "do").