The team at Oblo, who maintains the website servicedesigntools.org has worked on a few interesting ways of enhancing traditional tools used in Service Design with elements of Strategic Foresight, System thinking and Behavioral Change.

I've created a lot of templates and resources around Service Design. Most of them are made to make Service Design simple, but here two that are more for the advanced service designer:

Create a complete Service Blueprint with automated analysis features directly in Notion.

Share your Service Blueprint without overwhelming people by letting them choose which part to see first.

On the Swiss Innovation Academy, I maintain a page with all my more advanced resources (templates, courses, etc.). These are not specific to Service Design but many can apply to Service Design too.