How do I transition from a Sales Compensation Plan Design role into a Sales Strategy role?
Your experience in Sales Comp Design is definitely relevant for a Sales Strategy role. You have an understanding of the GTM model and roles, the Sales Org structure, and some aspects of the sales operation (e.g. quotas, rules of engagement).
You have the opportunity to build on top of your current experience, by preparing for an interview process for a Sales Strategy role. Here are some ideas (based on a similar question I've answered):
Find someone who went through a similar transition (from Sales Comp Design to Sales Strategy) and learn as much as possible from their transition process
Find someone who works in Sales Strategy for the same company and asking them for help with common interview questions. LinkedIn is a powerful tool to help jobseekers connect with insiders.
Get a referral. LinkedIn data shows that candidates with an internal referral have much higher odds to land the job
Check materials on "Consulting Interview Prep". There are extensive resources available online, and a Sales Strategy interview, although unique, will include some common aspects
Do basic research on the company (product portfolio, growth trends, culture) and the market it plays (competitors, industry trends)
Understand who is your interviewer and mention common experiences or connections during the interview. Also, understand the function they represent and reflect on the angle they might be evaluating you from
Prepare for an Excel test (when applicable). If you are not proficient at Excel, go learn it - this is a critical skill for the job, and you will need it beyond the interview