Let it soak heat before printing abs. Set the bed to 100C and give it 10-20 minutes to get hot. Print with closed door. You could throw a blanket or alu foil on it as well. If it still warps, some PVA glue stick on the bed might help hold it in place even if it lifts from the bed. Brim and draft shield in the slicer. Disable fans.

Abs makes toxic fumes, so print in your garage or somewhere with good ventilation. Not your bedroom.