There’s a fine line most restaurants walk - do I as a restauranteur change my menu seasonally, etc. or do I keep 95% of my offerings to gain momentum and keep people coming back because they just have to have my current food?
I find in my experience that having 10-15 solid entrees and appetisers keep most people returning for those specific items. Your clientele will make it “their own”. They’ll identify with that dish and they’ll tell their friends about that dish. “You have to go to so and so and have this and that”. If they’ve returned two years later and it’s “not on the menu anymore” you risk losing that customer. Granted some people like change, but most people don’t.
And of course always, always offer the highest customer service and etiquette. Cheers! Happy Dining!