Once you have gone through all the profiles in your area in Match, your radius will automatically be expanded. Maybe that one special person lives a little further away and it's worth taking a look outside your familiar surroundings.
Otherwise, you also have the option of finding people outside Match, such as browsing people near you in the Near you list. You could also modify your search settings a little, for example by selecting a slightly higher or lower age. This allows you to discover new people in different ways.