Why is my business failing?

I opened a children's store a little over 7 months ago. It is a baby and children's resale store, where we buy gently used children's clothing and merchandise and resell it. For the first 2 months we were doing alright making over $100 on most days of the month. Business has really gone down over the... show more I opened a children's store a little over 7 months ago. It is a baby and children's resale store, where we buy gently used children's clothing and merchandise and resell it. For the first 2 months we were doing alright making over $100 on most days of the month. Business has really gone down over the last 2 months, we average about $7-$10 a day now. There is another store similar to ours up the street but they have been open for over 15 years and there name is already well established. I pass by at least once a day just to see how the business is doing and they always have a lot of people in. Oddly enough the our landlord to the building that we lease is friends with the other owner, him and his wife play bridge every week with. He says he doesn't know why we are doing so poorly when the other business makes around $15,000 a month on average. I have not done any advertising, but I looked into it and it's SO expensive.
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