that is a good first step.
the problem now is....the roaches you can't see.
they will keep popping up as they wander around looking for food.
you should employ one of several roach baits available.
when a roach gets into the bait, they track it back to the nest, killing those roaches as well.
if you do not get satisfactory results from the bait, you may require the services of an exterminator (worst case).