Ok, I already understand what's going on. The problem is not the language barrier, because I know English very well, especially when it comes to understanding what has been written. I just missed a few comments recently, which I was going to write back to. It's not that I never engage in interactions, because before when I was less busy, I often replied to comments and I always appreciate when my post is cured even when I am not writing about it. I think I'll just focus on a smaller number of communities that I'm involved in so that no one feels like my involvement is too little than it should be.