Last week, I purchased a Korean journal like this one: https://www.amazon.com/gp/product/1706692005/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
The blocks will help with your writing tremendously. I started writing about what I do during the week. Then, I speak show my journal to my teacher so they can check my grammar. You will probably need a teacher or tutor to challenge you and give you topics to write about it.