You can make a natural roach bait using baking soda and sugar.
The baking soda and sugar mixture kills the roaches overtime by mixing with the roaches stomach acid which then kills them.
Take some baking soda and add a little sugar to it to make the roach bait and then place the sugar and baking soda mixture where the roaches are hanging out at.
You can also kill roaches by making a fabric softener spray using some fabric softener and some water in a spray bottle.
Then spray the fabric softener and water mixture where the roaches reside and it will kill them.
You should also squirt any roaches you see with the fabric softener spray which will also kill them.