How can I convert my negtive karma in to positive?

Also, ask yourself why you want good karma in this context. Perhaps the answer lies therein. The fact that you desire karma might be related to the reason why you don't have any.

If you are truly looking to be helpful and boost your karma, just try to be a good community member. Provide archive.is links for stories that are behind paywalls. Study the guidelines and follow them to the letter. Try to ask good questions and put some effort into adequately researching. If you post or comment something of low value, delete it.

https://news.ycombinator.com/newsguidelines.html

- Submit links to sites people might find interesting and curious to discuss. You can have up to 4 links on the first page of new submissions at a time.