If I were the size of a peanut, I would immediately think hard. What is a predator to me? Ants are likely predators, or at least dangerous since they're big now. Roaches would definitely be scary, since they'd be MUCH bigger than me. Random isopods in the bathtub could be potential predators too.
How will I stay safe?
First of all, I will obtain an acorn top and wear it as a helmet. Next, I will gather toothpicks and create a shelter. I will turn some toothpicks into wooden spears and hunt smaller isopods and ants. I will create various things to improve life and I will truly become one with the household ecosystem. I will live happily until I inevitably get murdered by a roach.
Okay, maybe that's a bit weird to think deeply about, but I don't care. It's funny.