We recovered from Google's manual penalty in January 2014. Afterwards, we changed our site design, fixed our content, fixed java scripting, disavowed bad links, increased our social presence, tried to engage customers in blog content, etc. But we still couldn't get our domain name back on SERPs. (It wont show our site even on first page if I search "best vpn service" on Google.com)
What should we do to bring our domain name back on the SERP?
What About Sandbox? What we need to do to get out our domain name from sand box?
Any comments or thoughts will be really appreciated
P.S: It was manual link penalty