Welcome to BHW! There are hundred of threads on the topic on the avoidance of the sandbox and how to get out of the box as well. The search button is your best friend but that said a combination of authority, continuous build of quality links and the addition of good content is key to your SERPs.
Thank you for your quick answers. So, continuous adding of quality links. not too many spammy links and quality content, maybe written on a weekly basis, may make people avoid the dreaded sandbox.