Hi Daniel,
An easy solution is to use the NoNumber ReReplacer plugin to change the "Read More" HTML (text & link) for each respective category.
I encourage you to be creative and scientific...you can try utilizing a catching a Call-to-Action and analyze the click-through rates, for example:
Read More
View More
See More
Watch It
View View & Text
Full Story
Full Article
Lean In
Also, remember you are change the HTML, that includes the text, the link (anchor, tracking code, etc), you can use font icons or even images.
I hope this helps,
Joe Campbell