Offer your services to an hospitality chain and create a proof of concept at one of their locations. A key element in this equation would be an application (ideally a web app) enabling the target hospitality chain to monitor brand booking requests. Successful proof of concept would then lead to stage 2, meaning scaling the strategy to more locations of the target hospitality chain.

Monetizing the business model could involve fixed monthly fees to use the application, or a royalty based model factoring in the proceeds from brands seeking to advertise.

Keep in mind that many hospitality chains are making a substantial part of their turnover from side businesses that you can help them market amongst their own clientele. For instance an upmarket hotel could make up to 1/3 of its turnover from its in-house restaurants, spas, etc.