There's discussion that can be had around this but for now here's some practical advice:
Seek out questions with no answers at all
Give an answer if you can help and if the question belongs here. For example:
Is it allowed according to our FAQ? If not then vote to close as "off topic".
Does it have a very low view count and/or is a problem that can't be reproduced by anyone else? Then it's unlikely to help others and should be closed as "too localized".
When voting to close, make sure it gets attention from other users. Post the question URL into our chat room or flag a moderator. (We'll create a special chat room for this if the main one gets too noisy.)
Seek out great answers in the unanswered questions list
There's not much to this, just choose questions from the list and learn something new about SharePoint! When you find great answers (and questions) vote them up. You may again find questions that don't belong here, so remember to vote to close when doing this as well.
One last thing
Please, don't vote on random answers for the purposes of improving our statistics! What makes our site great is it's high quality. Let's maintain that as best as we can.