Try cheap canned food, like "Special Kitty" from Walmart & the store brand from Aldi. Just buy 3 cans of each flavor, and see whether any are a hit.
Seriously. I spent YEARS trying to coax my cats to eat $2-3/can cat food, like Tiki Cat & Weruva. They wanted nothing to do with it (though one cat did kind of like Solid Gold Tuna from Petco). At one point, I said 'fuck it' & decided to try cheaper brands... and one or two flavors of some of them ended up being a hit, to my complete shock.
It's impossible to predict what they'll like, and don't write something off until they're rejected it at least twice. That's the nice thing about cheap brands... if they reject it, it's not the end of the world.
Also, don't assume a flavor of one brand is similar to a flavor of another brand. One of my cats LOVES Special Kitty salmon pate, the other won't touch it. Aldi's Salmon pate is hit or miss for both. My cat who loves Special Kitty salmon pate won't touch Friskies salmon pate, but my other cat likes it.
And it's the same story with other flavors & brands... though I'd say out of all of them, Special Kitty pate seems to be more consistently liked than other brands.
Fancy Feast's quality control is fucking awful. I've seen two cans of the same nominal flavor, with the same UPC, that were UNRECOGNIZABLE side by side as allegedly being the same. When my cats get a good can of FF, they love it... but it's fucking impossible to tell the good and bad batches apart, and I'd say at least 1/4 of their batches are "bad".
At the slightly more premium end, try "Best Feline Friend" (available from Petco).
If your cats lick the gravy & leave the meat, it means the food itself tastes like shit. In general, pate tends to taste better to cats.
I've had bad luck with Nutrish (in plastic cups)... my cats like it, but it makes them vomit afterward. Ditto for most of Petco's store-brand cat food, especially the non-pate pouch & plastic-cup varieties.
One of my cats (a hardcore gravy-licker) LOVES Meow Mix Tender Favorites (plastic cup)... the salmon+crab (pink) and tuna+shrimp (blue) varieties.
Note that most cats aren't terribly fond of beef... partly, because "cat food cows" are almost always slaughtered dairy cows & taste yucky because they're old & way past their prime.
"Poultry" in cat food varies wildly in taste, too... some use macerated male chicks, some use elderly egg-laying chickens, and almost none besides super-premium brands use the same chickens & parts sold for human consumption... and it's almost impossible to tell which is which.
Salmon is probably the most consistent ingredient, because it's so abundant & cheap anyway, there's little reason to cut corners with it.
"Whitefish" REALLY means, "pretty much any random fish they got a good deal on that week". Sometimes, it tastes good. Often, it doesn't. Your cats' willingness to eat it will vary, even among the same brand & flavor.