You simply have to be ruthless and kill them, they are disease carriers and capable of doing great damage, including starting fires.
If you’re using new traps, rub food onto them to mask the smell of the metal/wood. Also use different baits depending on the circumstances.
If the mice nibble for example cheese or other bait on the traps, then use something that will take longer to eat, like chocolate to increase the chances of the trap being released.
I have two traps 2 feet from each other, at first the mice ignored them because the where new, however I replaced one trap with one that is years old and the other was brand new so I put it into some soup and left it for 24 hours.
I haven’t had any mice for about 1 month, that said I’ve killed about 9x in a 4 month period over the winter.
+1 for the little nipper traps, a good design that works well.