How to compute custom id to grow to infinity

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C#

Hi
I have a user define function as below, to compute a custom Id using PK Id as guide

 CREATE FUNCTION [dbo].[CustomeId] (
 @Prefix NVARCHAR(10),
 @Id INT,
 @Length INT,
 @PaddingChar CHAR(1) = '0'
)
RETURNS NVARCHAR(MAX)
AS
BEGIN

RETURN (
 SELECT @Prefix + RIGHT(REPLICATE(@PaddingChar, @Length) + CAST(@Id as nvarchar(10)), @Length)
)

END

In my sql table's Computed Column specification I have:

([dbo].[CustomeZoneId]('GH-',CONVERT([nvarchar](10),[Id],(0)),(10),'0'))

and out put is GH-0000000001 , GH-999999999
but I want it to be able to grow to infinity along side the PK Id. something like GH-1 to infinity

What I have tried:

([dbo].[CustomeZoneId]('GH-',CONVERT([nvarchar](10),[Id],(0)),(10),'0'))