Making the restaurant look expensive is the wrong way to go; people will just start to assume the food is also expensive or even begin to think that a $5 value meal is expensive when it's actually not.
Making the restaurant look clean, welcoming, and comfortable is absolutely the thing to do, though. Anything that will remind someone of a McDonald's or a Burger King or any other huge name needs to change, even if it is a member of one of those chains. If the food is good, make sure people know this. Advertise Advertise Advertise!!!
A lunch special might also do you well. If you can afford to bring the price down to a bare minimum profit margin, do so for, say, 11am to 3pm.
Making the restaurant look clean, welcoming, and comfortable is absolutely the thing to do, though. Anything that will remind someone of a McDonald's or a Burger King or any other huge name needs to change, even if it is a member of one of those chains. If the food is good, make sure people know this. Advertise Advertise Advertise!!!
A lunch special might also do you well. If you can afford to bring the price down to a bare minimum profit margin, do so for, say, 11am to 3pm.