The booking engines are your partners.

They will display your hotel within a list when someone is looking for a hotel of that description in your area.  They will email newsletters with promotions for you around the world and they will offer you support when needed.

Some are actually hotel search engines but will redirect guests to other booking engines to book. 

 

Some of these booking engines are commission based, but well worth the value of a possible booking.

 

There is a vast selection, so pick wisely...