There are several ways
use a delay node in rate limit and flush messages Help with message queuing (maybe a repeat) - #2 by Colin
Or semaphore node node-red-semaphore-plus (node) - Node-RED
Or simple-gate node node-red-contrib-simple-gate (node) - Node-RED
There are also other queuing nodes available, and you can also use a switch node and context variable Disable flow from anoter flow? - #2 by E1cid