I’ve never run out and I doubt I will
Of course, there are the local attractions. But bear in mind that everyone else is writing about them so an original take on them is better.
Often an idea for a article can be broken down into several. For example, visitors to any area will want to know where to eat locally, especially if recommendations are personal. But instead of one article that can be split into many:
Where to eat breakfast
Romantic places to eat
Where to buy picnic food
Where to dine al fresco
Etc. etc. etc.
Eating can provide at least a dozen articles! Local history is popular too, specialist sports, places that are dog-friendly, anything to do with children, great places for scuba, water sports, recommended bargain places to shop, hidden local gems, festivals, local landmarks, cycling in the area, where to rent [just about anything] safety in the sun,beach etiquette, walking tours, ‘a day in xxx’, what to do if it’s raining, museums, etc. etc. etc.
Then there are articles just about your listing - why it’s pet or kid friendly, why its suitable for businesspeople, for honeymooners, for people who like to hike, for golfers etc. etc. etc.
If I ever run out of ideas, I’ll let you know
I promote them mainly on social media. I currently get the best results from Flipboard, Twitter and (I’m afraid) Facebook, although I’ve used several others in the past. It really takes a lot less time than messing about tweaking listings.