Better spacing on your paragraphs. It might seem like a small thing, but when I grade papers and see a massive block of text, my eyes glaze over. If you're talking about different ideas, then start a new paragraph in order to make your points more easily found and readable. It's not something I notice with your posts specifically, but something to remember.
In addition, simply varying the length of your posts? Not every post needs to be large and substantial, save those for when you really want to stress a point or have some interesting topic to discuss. Sprinkling some shorter, lighter stuff in your writing helps a lot as well, as it gives the reader some time to breath here and there.
And I suppose, simply don't use the "likes" you get on your posts as a metric. I rarely like anything, unless it's on a topic that's very interesting to me or is continuing a good conversation. Or just made me laugh. Just speak your mind, and try to flow with the conversation topic at hand. The unfortunate reality is that smaller quips are often easier to read through and consume, but you shouldn't let that stop you from making thoughtful posts, if that's the way you want to communicate on here.
Basically: don't let stuff like likes deter you, and there's no need to be insecure about people reading your posts. Keep discussing, take part in whatever the thread has decided to fixate on that particular day, introduce some interesting topics to discuss, and vary your spacing and phrasing. Or, in smash terms, play the neutral better, have good DI, and space in ways that make the match more interesting.