First of all I'd advise using Grammarly paid version, even if you have good English language skills it will come in handy.
I won't discuss the content because other commentators mentioned a lot of good tips, but what helped me a lot was speading my content. I shared it on social media, friends, forums, reddit, you name it. I posted everything on medium and in a few Months of active writing I started getting offers from other news sources to pitch for them. That's where my copywriter career started, maybe it will be of some help to you.
I won't discuss the content because other commentators mentioned a lot of good tips, but what helped me a lot was speading my content. I shared it on social media, friends, forums, reddit, you name it. I posted everything on medium and in a few Months of active writing I started getting offers from other news sources to pitch for them. That's where my copywriter career started, maybe it will be of some help to you.