If your site is relatively new to Google, it is quite common to see it appear initially and then disappear.
Or Your site hasn't been optimized for search engine compatibility.
If you're sure your website was previously listed in Google, Check and remove any hidden tricks or spam. White text on white background is common. This is likely to be the main reason for being banned or dropped. Check for hidden elements, doorway pages, client sniffers sending different content to different users etc.
Although you can't ulmimately control your inbound links, avoid bad neighbourhoods such as massive link farms, spammy directories full of adverts etc when seeking links.
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