Clustering custumersin time

How would you go about clusturing 2M clients in time, like detecting fine patters (active, then dormant, then explosive consumer in 6 months, or buy only category A and after 8 months switch to A and B.....). the business has a between purchase median of 65 days. I want to take 3 years period. submitted by /u/Capable-Pie7188 <a href="https://www.reddit.com/r/data