As far as I know and have experienced, you head to discord and locate 'baggage-car_post-promotion' room where you find at least two posts there, head back to Steemit to upvote and comment on the posts, then go right back to the 'baggage-car_post-promotion' to let everyone know you have upvoted and commented, be sure to tag the authors of the chosen posts.

Finally, you can stick a link of your post in the same 'baggage-car_post-promotion' room. From there, your post might be picked by those engineers and featured here.

Like this

Hope this helps.