Check with your local library and determine if they have access to subscription databases that may be helpful in your research. There are obvious ones like Ancestry.com, Fold3, HeritageQuest, but also academic databases, periodicals, etc. may be useful in your research. Academic journals may contain historical articles related to the area where your ancestor lived and while they may not mention your ancestor specifically, the history may be helpful. And these articles often contain references that may provide additional information.