When you say workflow are you asking for a script that you can run that will automatically change them?
You could easily create an Omni-Automation that changes all “This Week” to “Next Week” on all remaining tasks, when you run the plug-in.
If it was me, I would just build this into my weekly review if you are following the GTD methodology. I actually have a perspective for “This Week.” I evaluate it in the “Review Action Lists” under the “Get Current” section. Here’s a helpful podcast episode that does a guided weekly review if you aren’t familiar.
Review Action Lists
Mark off completed actions. Review for reminders of further action steps to record.