When should we rethink our caching strategy?

hey everyone, I've been thinking about how we approach caching in our systems. Weve got a few different places where were caching data, from database query results to API responses. For the most part, its working well and definitely speeding things up. But Im wondering, at what point do we hit diminishing returns? Are there specific metrics or indicators that suggest our current caching approach might be becoming a bottleneck or too complex to maintain, and its time to explore alternatives or optimizations?