The following post describes an A/B test comparing the 'ghost' button style vs. a button with white text and a dark background.
https://www.elevatedthird.com/article/ghost-buttons-good-bad-spooky-part-2
The post suggests that a more traditional button style with a dark background has a higher clickthrough rate than the 'ghost button' style we're currently using. Granted, this post is only describes a single test, and aesthetically I prefer the 'ghost' button, but I'd be curious to see if this style change would effect clickthrough rate.