Firstly, don't worry about mistakes- I'm a teacher and I make them too, because I am a lousy typist and post before I check things all the time.
Having spent a considerable amount of time in this and other forums over the years, I have noticed how threads grow, or not. Because of the numbers of new posts, and most people head for the New Posts button, hreads can get buried very quickly, so if you want a thread to stay alive, you have to keep it there by visiting it regularly and posting in it. Newcomers will also often go back and bring back threads that no one has looked at for months and they start off again.
It's hard to know what people will reply to. We had a thread that went on for weeks about whether to say 'frying pan'or 'skillet'. I have no idea why this attracted so much attention. However, the more general a topic is, the less likely it is to get many replies. If the thread is more specific, then it will automatically invite posters to answer. Where people have something to get their teeth into, they will get stuck in.
It is also a good idea, as a learner, to post in various different threads and become involved in the other discussions that are taking place, which will draw peopleinto the areas you want to talk about. Please don't feel shy about replying elsewhere- it's what a forum is for.
There are learners of all sorts of different standards here, from beginner to native speaker level. Not speaking as well as someone else does not mean that someone has less to say or that their ideas and thoughts are in any way less interesting or valid.
As one of the people moderating the forum, I tend to concentrate in certain ways- I try to ensure that all posts get an answer and that new posts are replied to, which means that once a thread has been answered, it will disappear of my screen in a couple of days and I think that many of us work in that way, so keep it alive and we will be popping in all the time.