Changing attributes to search attributes

Hi, I have 300+ products on my site using woo. I have uploaded the products through a .csv file and the attributes were created as custom woo attributes. I have made the attributes in the back end and have set the properties as per requirement. But there are no changes seen. Is it because they are custom attributes? If so, how can I convert the custom attributes to swatches attributes? Without having to manually open each product edit page and removing the attributes and then again adding the same attributes…. Please help me. It’s urgent.