Short answer: Not automatically at the moment. You can manually change the service status to WAITLIST or CLOSED if you'd like.
We don’t currently do automatic “slots” because that infers first come first serve (and our system is built on artists’ choice - so you can accept in FCFS or whatever order you’d like). That said, we do plan on adding more options like this in the future.
In the meantime, you can manually keep track and change the service status to WAITLIST or CLOSED when you’ve reached your desired workload.
Note that you can also easily transfer requests from NEW to WAITLIST if you get too many requests. Clients will get notified of this change and will have the option to cancel their request if they don’t want to wait.