Silverfish are known to like damp areas (75 to 95% humidity), that’s why it is recommended to reduce it to about 50%. This can be done with the help of dehumidifiers and fans. Fix everything that leaks, minimize available water, ventilate the attic and closed rooms.
Caulk cracks and crevices on walls, floors, and holes around pipes to prevent the insects from using them as an entrance.
Inspect and clean ALL your possessions, including the contents of boxes, wardrobes, cupboards, book shelves, clothing, etc.
Put all possible food sources into plastic air-proof containers.
Vacuum, mop and dust your house frequently to remove eggs.
Repair or remove wallpaper.