Be the person a client can reach, and the reason they stay.
Once a project starts, somebody has to keep the client informed, protect the team from scope creeping in through casual WhatsApp messages, and raise problems early instead of at the deadline.
You do not need to write code, but you do need to understand enough to know when a request is a five-minute change and when it is a fortnight.
Calm under an unhappy call is most of the job.
Excellent communication, comfort translating between a client and a developer, organised follow-up.