That’s a great prompt—there are so many directions that sentence could go, depending on whether you’re thinking practically, symbolically, or humorously. Here are a few ways to finish it:
Practical/Pest Control:
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“…it’s a sign that there is easy access to food, water, and shelter—usually crumbs, grease, leaky pipes, or cracks in walls.”
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“…it’s a sign that one might have hitchhiked in on a grocery bag, cardboard box, or second-hand appliance, not that your house is dirty.”
Spiritual/Omen (from various folklore):
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“…it’s a sign of impending prosperity and good luck—in some cultures, cockroaches symbolize resilience and resourcefulness.”
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“…it’s a sign that major changes or transformation are coming, since they are ancient survivors and masters of adaptation.”
Humorous:
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“…it’s a sign that you are now officially running a free insect hostel, and they’re leaving a zero-star review on Yelp for lack of midnight snacks.”
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“…it’s a sign that the cockroach ambassador has arrived to negotiate terms of cohabitation.”
Chilling:
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“…it’s a sign that for every one you see, there are many, many more hidden in the walls.”
Which direction were you thinking of? I can elaborate on any of them.