Advice re Blocking mice holes pls

I have 100 yr house
I blocked a gap in bathroom floor and wall with steel wool . A mouse actually made a perfectly shaped half circle hole just adter the steel wool
I’m scared if I put more steel wool they will keep wrecking my floor more with these holes

someone said to put some bricks or something heavy there

any other suggestions

my old house might have lots of mice holes everywhere

I never caught any with traps but the mouse poison must have killed a lot as now the poison doesn’t get eaten much both indoors and outdoors .
Any other experience or advice welcome

there’s no other food lying around food is all in sealed containers or fridge

 

does someone know about metal sheets from hardware to put over holes or areas so they cant eat through again on floor edge. or will they just eat thru elsewhere nearbye like they already did?