If you have built your physique to a level you are happy with, obviously you were eating excess calories above maintenence.
Why not just reduce your calories if you just want to keep what you have built and train the same way you were when building your physique?
Or are you looking to reduce your training to a minimum while still keeping what you have built? If so, maybe you could do a full body routine maybe twice a week to maintain? It would be different for everybody and would have to suit your schedule and personality.
How long have you been training?
I find it hard to believe that anybody will really truly be happy with their physique goals, and not want more.
You will never know until you get there.
There is always room for improvement, unless you have reached an elite level.
Personally, I've been training on and off for 10 years, alot of complete years off in that period though. Never put more than a few months together so little progress.
But now, I have been consistent for about 6 months and have had good results. I'm thinking that I will reach my ultimate physique in about 5 years from now with consistent training and diet.
I have learnt that a great physique takes time to build and mature.
Good Luck.