Some of my questions and answers do not have any up or downvotes. Do my questions and answers need to be improved or has no one seen them? By looking at my profile page, I see that some of my posts seem to have not received much attention.
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Well, I don't think you need to work on your questions anymore if they are solved. Also many of them have votes too ( 9/11 is a pretty good ratio,isn't it?), I can't see any issue with your questions !
Your answers haven't convinced the OPs yet, and many of them seems like just comments to me. If you are sure that you can improve them..go ahead. Good luck
My rule of thumb: If you feel you have to ask about improving, then you should at least try to improve.
Two of your questions did not receive upvotes:
You received answers to both questions, so I would not recommend changing them now. For future reference, the questions most likely to receive upvotes are the ones that are most likely to help a broad audience.
At the time of this writing, the first question referenced above has received 50 views and the second has received 15. You can find the view counters in the sidebar.