Back when I trapped, I would stuff pieces of cotton balls in the metal part of the victor mouse traps, then put peanut butter in the cotton. They would have to tug on the cotton which helps trip it. Also as mentioned above, adjust the mechanism so rod slips off easily.
Having said this, as a former professional in pest control in the military, trapping should be the last resort. You should first be eliminating entrances for mice (their skulls are their limit, which can fit through dime size hole). Also eliminate habitat for them outside, such as weeds, grass, piles, or anything they can hide in. Also eliminate food sources, as their reproduction increases with more food available.
Years ago we bought this place and I soon noticed armies of mice coming in the garage. I trapped a dozen in one night. Discovered they had eaten out the inside of the insulated walls, so had to tear apart and redo that plus the wiring. Anyway, I went outside and noticed a gap above the foundation through which they were entering. Filled it with foam from a can, and that was the end of mice inside. Also noticed a large pile of pine needles near the house in which they lived, and had a freeway over to the house, so I eliminated that. And the prior owners had a dog living inside the garage with endless supply of dog food for the mice, stashes of which we found inside the walls. I don't feed more than my dogs will immediately clean up.
I also had a lot of mice stealing chicken feed, and was trapping all the time until I built pens up off the ground. End of problem.
Also keep all my grain in metal garbage cans and am careful to avoid spilling.
In the military on a training base I was called to some dorms where airmen were getting mice in their rooms clear up on the 4th floor. Couldn't figure where coming from until I got down and looked under the heaters on the wall fed by hot water pipes coming out the concrete block walls. Sure enough, big 6 inch holes in the wall around the pipes. So mice had free travel up through the walls to the whole place. Told them to seal around the pipes.
So I realize trapping is fun, and results in some kind of satisfaction, but the first thing I would be doing is hunting around the house for any kids of opening, and remember to get down and look up, around the foundation, and pipes, and start sealing things up. And clean up any messes or piles or weeds or other habitat withing 100 feet of the house.