Get the jell and put it everywhere that seems reasonable. Windows, doors, outlets, switches, etc. Get some of that boric acid dust and spray it behind all the appliances, remove the outlet and switch covers and spray the dust in there, too. Put the traps under every appliance and in every closet and cabinet. Don't forget the areas where there is water, like washer, dryer, dishwasher, sinks, bathrooms, etc. Is there any crawlspace above the house? If so, use the Raid fumigator bombs. Get the regular aerosol bombs and do the living area. Leave the house for a few hours, then return to open the windows and air it out. Leave again for a few hours while it airs out. Get some of the strongest stuff you can find with Diazanon and some kind of pyrethroids (all that stuff that ends in "-thrin") and mix them up really strong in a pump sprayer and spray around the perimeter of your home, around the eaves, and around the windows and doorways. Spray up underneath the house as well, paying special attention to places where electrical and water lines enter and exit.
No more bugs.
This is, of course, after you've cleaned the place with a fine toothed comb.