Even with the name of your ancestor’s employer, it can be difficult to locate additional information. Many businesses were not large enough to even keep records long-term, some have long since gone out of business, or others destroyed old records long ago.
Some options are to search newspapers for information about the employer, city directories, county histories, etc. These items are often available digitally making such searches much easier than in the past. These references probably won’t mention your relative by name, but they may provide some additional background helpful to your research.