You can link a custom URL to “Read More” using the Post Grid Combo plugin. This article will help you to link the Read More to a custom URL.
To begin, insert a “Read More” block.
Click on the “Read More” tab.
Now choose “Custom URL” from “Link to” to link read more to the custom URL.
To add the custom link, click on the “Custom URL” link button and add the link here.