If you are a top notch, worldwide known photographer, it is very likely that customers from all over the world will want to use your services (for fashion, events, sports, architecture, products etc.). But as we are focusing on travel photography, commercial organizations that deal with traveling and tourism are more likely to hire you. Notable examples are hotels, tour companies, airlines and so on.
In contrast with most of my peers, I seldom use Photoshop and have never used Lightroom. However, I rely on three post-processing/editing apps as my tools of choice...these are Color Efex Pro (originally of Google and now part of DxO Software, Iridient Developer (the raw image format processing software for macOS, and well known for its ability to process Fujifilm X-Trans raw files), and lastly ON1 Photo Raw ( a raw processor, photo editor and plug-in collection all in one).
Whether at home or abroad, when you know the ins and outs of a particular location, you can provide photography tours and location-specific workshops to serve both tourists and serious photographers. In Greece I found a professional photographer offering pricey photo tours in Santorini, a popular island with stunning viewpoints that are difficult to locate. Part of this photographer's service was to unveil these secret locations. Back in Holland, photographer Michiel Buijse offers nighttime photography workshops in Amsterdam, helping photographers shoot stunning long exposures along the historical canals. Consider what you can offer in a location you know well.