How to become a great writer?

Hello wso community,

I've thoroughly enjoyed this forum not only due to the level of intellect of its members (on the aggregate), but also due to some members' truly excellent writing. Some of the comments/pieces I've seen on here have captivated my attention, and I want to know how you all do it.

I plan on applying to business school in the fall '19 season and I'd like to know what I can do between now and then to drastically improve my ability to pull adcom readers into my essays effectively and convey my story powerfully.

I come from a quant-heavy undergrad and so I was never formally educated on the more liberal-artsy facets of education. To those of you who are self-aware proficient writers - how did you develop your skills? What can I do in under a year to get to that level?

Thanks in advance.