How can I solve?

The biggest number of responses I had so far was I think 5 or 6 for one discussion. The others some are zero and some two or three. I think as I spend more time here I will learn how to choose the topics that get the responses.

When you pick a best response then it is no longer consdiered an open discussion but others will still be able to respond to it if they wish . As far as the one's with no responses , don't worry about then , you never know when someone might come along and answer them . You will always be able to see in your undisclosed discussions what still needs to be answered to with a best response . I am not sure how long it stays in the server but you don't need to worry about that anyway . Hope this helps :)

I think getting responses is a luck thing here. I think if you have alot of friends here, they might help you out a little bit more. I do not know how long they will keep them if you don't get a respond.