what kind of salmon. farmed or wild?
wild has a much better taste/texture IMO.
also try smoked salmon. but not the thin sliced stuff, try the stuff that looks like cross section of the fish. for me its a texture thing on the smoked.
https://wildalaskasalmonandseafood.com/wp-content/uploads/2017/11/Echo-Falls-Traditional-Flavored-Smoked-Salmon-4oz-2021.jpg
also, salmon one day every week. I know that you might like it, and fish, generally is good for you. but is it possible that the kid has had enough salmon and it burned out on it..
how about trying another type of fish. like halibut or swordfish, still has the meaty type texture.
also change up how you preapre. cedar plank on a grill? roasting in oven. Blakened in a skillet.
try varying the seasonings.
Two off the wall method I use when cooking just to change thing up is a glaze with Brown sug Butter Dill Cyan
and a mayo based glaze Mayo Salt,pep pressd garlic cyan pep
I will not eat farm raised or Atlantic salmon. for me is wild sockeye all the way. yeah I know its twice the price, but the flavor is so much better..
good luck...