What do you know now, that is useful and pertinent to your professional life (or even your personal life) that you didn't know 1 year ago?
Whatever it is, the chances are there are plenty of people still at the '1 Year Ago You' stage who could do with hearing about it. So why not blog about it, write an article about it, or submit a proposal to speak about it at a conference or event?
I know lots of people who don't do any of those things because they consider that they simply don't have anything to say. It's easy to fall into the trap of thinking you have nothing to contribute - there's so much dialogue already, after all. And Imposter Syndrome runs through our profession like a vein.
Imposter Syndrome: For a Man, or a Woman
But we want new perspectives. We love to hear others' experiences. We need to know what has worked and what hasn't in professional situations other than our own. In short, we do want to hear from you, and we'd welcome your professional development output. (That's the rather awkward phrase I've come up with to describe the kinds of things we do as part of our online presence, or at professional events.)
Framing what you might choose to say as 'advice for 1 Year Ago You' is often enough to make people realise, actually, yes, they could present a paper or write a blog. The blog you are reading now is almost entirely aimed at Past Me - we're all learning useful stuff all the time and where appropriate I try and repackage that into something others might find useful. Most of the posts on here are about things I wished I'd discovered sooner.
Of course, it doesn't have to be '1 Year Ago You' specifically. It could be '6 Months Ago You'. Or '1 Day Ago You'. But someone, somewhere, will be at the exact stage you were before you learned about that useful tool / technique / concept / article / platform / literature or whatever it might be, that made it all click for you. So 'cascade the knowledge', as they say - you DO have something to say, and there will be an audience for it.