Hi,
Here is how you delete a record in Softr: How to delete a record with a button, using Make
Here is an other thread about favouriting: Action button - Formulating the url of a resource to embed code - #11 by matthieu_chateau
An other solution is to use the edit option (in a list details block for the item to be added to favourites/removed from favourites) + edit permissions. This would be linked to a single select field in your airtable. The user would be able to open the edit modal to change the value of this single select field, for a specific record. The two options would be “Add the item to favourites” / “remove the item from favourites”.
The favorites page would display a list block with two conditional filters: only the favorite items + items that only belongs to the logged in user.
The not favorites page: only the items with a blank value (not set as favorite or not favorite) or items removed from favorites.
This way you won’t have anything to do with formulas (there is not really code to be used). Though this is not really good user experience. But that’s your call, maybe it’s good enough for your use case.