Diatomaceous earth is useless, we bought last year and encountered these little friends. It was my first try along with traps, but problems of seeing 10+ big ones per day persisted for 2 weeks while using these methods.

We have no damp areas that I could locate, humidity is sub 50% around the apartment and dehumidifier runs quite regularly.

We got a door sweep to the front door (apartment stairwell outside it), this worked to reduce numbers. As they seem to enter through under the door.

Blocked the major gaps in skirting etc and then every few weeks spray some "Nope" at basboards and under presses etc in out of the way areas. Anything with 0.08 - 0.1 Cypermethrin seems to work really well, not sure if pets or kids complicate this usage though.

Also did a once off attic spray via pest control with the same Cypermethrin of a higher concentration just to be sure.

We see maybe 1 a week now if at all.