By electronic distibution. So short the answer so wide is the span of distribution opportunities and channels for hotels. The electronic distrubution partners are countless a thourough distribution planing therefore essential. With a good distribution strategy the "targeted" guest segments are met as well as segments that seek special offers or package holidays via the internet. Every hotel has its strenght which must be used as an advantage to generate more business. Just make those chances work for you!
In order to get a better overview and feeling for the the different distribution paths numbers need to be evaluated and every new action made measurable to compare results.
An external distribution check would be best to analyse the "status-quo" of your hotel.