There are many options when it comes to places to publish your science communication. The majority is online and which to choose depends on who their readers are, how big impact you want and get achieve with the media in question and how much effort is required from your side.
Your own blog
Create a free online blog and published your article. Share in your network and via Twitter/social media channels.
Popular science magazines
Most of the traditional science magazines started as printed media and moved to the digital platforms along with the rest of the world. The advantage of publishing here is that you reach both the digital readers and the readers of the printed media.
Online science news
Over the years more and more online news platforms pop up on the internet. They work pretty much like the traditional science magazines, only they tend to also have up-to-date news in science. Typically this means shorter articles that are straight to the point – also to accommodate the probably limited attention span of some of the online readers. You can always check the legitimacy of the news site in their About-section – and if the information is not there, it is probably not a good news site to publish on anyway.
News papers are present online and in printed form. They should be accessible via the contact information on their website. You can publish as a feature article or column (with you as author) or you can pitch your piece to one of their journalists.
Several of the broader social media (e.g. Facebook and LinkedIn) allows for publishing from private accounts. The benefit here is that you most likely already have a network to share it with – the question is just: are they your core audience?