There's no way out of the sandbox but to wait. It's common practice to see your site rank quite highly for a few days after the initial index and to see it get sandboxed soon thereafter. Once Google's had time to evaluate the content, they'll pop it back into circulation.

It can take a few weeks to months but that's just how it works and there's nothing you can do about it. Don't sweat it, it'll bounce back once things even out.

Try to be patient and use this opportunity to build links while you're waiting.

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