You could look at letting restaurants claim their listings and offer them a pro package of services. Maybe menus, or even try offering online ordering. Being local you have an advantage that you can easily meet with restaurants in person.
I am always drawn to developing something for restaurants as their websites are notoriously bad, same with only ordering most aren't near as easy to use as they could be.
I don't think ad revenue is going to bring in a lot of revenue. Maybe $7 to $10 per 1,000 page views. So with less than 1k views you'll probably need to look at monetizing another way if that's your goal.
If you just want a fun website you can improve and run as a fun side project, keep going.
Yeah, it was bad restaurant websites, with PDF menus, that inspired me to build the site.
If you enjoy working on the project keep it going.
I feel like the one area restaurants might pay for or give you a revenue share is online ordering. Maybe you could become the go to online ordering app for restaurants in your area. Not trivial to build though but an area they might be willing to pay you for.
Good luck with the site.