Most people don't know about this feature, but Ctrl + D will select the next match:
https://www.keycdn.com/vid/blog/select-next-occurence.mp4 (source article)
This is a feature that exists in many modern text editors such as Sublime Text, VS Code, etc.
I'm wondering if there is an undo for if you selected too many and want to go back and undo the latest selections made this way without starting over. In Sublime Text the way this is done is with the Undo Selection functionality.