A Cosmos DB application places nearly every write into one logical partition. The account has available total throughput, yet the hot partition is throttled. Which design change is most relevant?

1. Reevaluate the partition key to distribute the workload across useful high-cardinality values
2. Keep the same hot key and only rename the container
3. Change every document's descriptive label without changing the partition design
4. Add private DNS records as a throughput fix