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Going for trout? Some of this may seem obvious but if you don't know, you don't know. Try different retrieve speeds, try letting it sink longer etc. try to stay back from the water also because fish see like picrelated, if you can see them, they can generally see you. If you're walking about heavily on hard ground near the shore they'll sense that too, the way you can hear what's going on at the other end of the house when you have your head underwater in the bath.
Don't sit thrashing the same piece of water either, take half a dozen casts in a fan pattern and move along a bit until you are casting on to new water, or take a cast, step a few paces over, take a cast, repeat. I don't know about the kind of waters you're fishing or what the fish are eating but if you suspect it to be mainly insects, you might have more luck on the fly. Otherwise, try fishing with trout spoons and little hard metal fry imitations, with these you can go for a straight retrieve, varying the speeds/depths until you start getting bites, or you can try stop and go, letting it swim along for a bit then pause so it flutters down, before giving it a little tug and carrying on. Often a fish following this will get FOMO as the lure they're checking out shoots away from them and they'll instinctively strike at it.
The idea of fishing as a patient activity is in some ways not the ethos to adopt when trying to catch fish, if things aren't working, try something else, you won't catch much standing in the same place, casting and retrieving the same lure in the same way. Even if your lure, cast and retrieve is exactly what the fish will take, if you're thrashing the same spot, if the first couple casts don't get a fish you aren't gonna get bites unless a random patrolling fish comes along. Same idea for the other aspects, you can make your way up a shore with a great lure but if the retrieve isn't what they're going for that day, they just won't take.
tl;dr - move about, change up.
