Focus on the kitchen and bathroom. Use bait stations in dark corners and Growth Regulators (IGRs) , which prevent young roaches from reaching reproductive age.
A natural powder that dehydrates insects with exoskeletons (ants, fleas, roaches). Sprinkle it in cracks and crevices.
Before buying chemicals, walk around your home. Pests are opportunists; they need a "highway" and a "buffet."