I had a minor but very noticeable infestation a few years ago, I’m guessing from a used blender I bought (picked up from someone at a not very nice looking apartment). Tried all kinds of things, and what finally made it go away was Advion bait gel and a general understanding of where they like to be. Just a tiny dab in lots of places. Obviously start in the areas you see them most, but my understanding is that they don’t really like open areas. So put a tiny bit in every little corner, crack, and hole you can find. From what I remember, roaches will eat their own after they die, which means they’ll ingest that bait gel and one “dose” will cause a nice chain reaction.