We also have hashtags, which are integral to Mastodon!
Using hashtags in your posts not only helps folks finds you and your posts, but they also help others filter out topics they want to avoid.
So, do use hashtags in your unlisted/quietpublic posts. So, your followers who love your art, but don't want to see food? Use a hashtag like 'food' so that they can see all of your posts except for your food posts.