I fear this is signaling due to a back channel threat. Some certain regime may have attempted strategic blackmail, and this is China's response. Otherwise there's not much point in concentrating so many tests at once, when telemetry from older tests are still being reviewed.
It would be silly at this stage for China to launch some ballistic missile to signal some displeasures and send some messages to certain party or parties. What exactly are the messages to send? That China has ballistic missiles? That there are some more advanced ballistic missiles in its possession? All these would equate China to be another North Korea.
China is testing ballistic missiles more frequently is simply because China needs to--it likely has quite a number of new ballistic missles development programs underway or they're on accelerated pace testing them.
Sometimes, the simplest explanations are the closest ones to truth. Call it Occam's Razor.