About now for a tune up, cable stretch and bedding in of all bits should have happened, after this tbh depends on how much/hard you ride personally I like to fettle my bikes myself on an ongoing basis, if something doesn’t feel right I fix it and generally keep things running smooth all the time.
Example for the as and when I am pretty hard on bottom brackets (low revolution speed but high gear) but brake pads will last me for years,
I do think there’s something pretty satisfying/theraputic about sorting your own bikes too and having 6/7 in the house between the family it saves a fortune too