Woocommerce change text button for 1 individual product

I have a product that is a once a month class and does not need a subscription. I had to add it as a single product. However, i do not want the “add to cart” text since it makes it look like a paid product.
I am trying to find a way to change this single product text button to “sign up now” without it affecting other products I already have or products I will be adding in the future.
There are many threads about changing the text for woocommerce buttons but they address broad products.
Does anyone know how to do this? Thank you, Jillian