Report stolen bikes to your local police department. Make sure you include specific details about your bicycle in the report, including the serial number. According to the Minneapolis Police Department:

Be sure to include in your report details about color, make, model, bicycle serial number, registration number, and other unique identifiers. These details not only aid in the identification and recovery of lost or stolen bicycles and return to their rightful owners, they assist investigators with developing useful suspect information.

Keep an eye out in used bicycle markets including Facebook Marketplace, eBay, Craigslist, and pawn shops. You can also try posting on the Twin Cities Stolen Bikes Facebook page.