Customer success strategy for agencies

Hi all! I'm new to the GGR community, and I'm happy to be here! I work for a small consultancy that specializes in building + maintaining a data stack for clients. With a background in SaaS customer success, I've been working on outlining a formal client success plan for the company as we continue to scale. 

I'm wondering if anyone here works in the agency // consultancy space, and has any tips for building out CS practices. I've run into some unique challenges and most of the resources I've found online are geared towards SaaS // product based CS orgs. 

Thanks in advance!