Having a business structure is irrelevant. You are earning money to whatever degree by selling items for profit. This seems like more than a hobby or just getting rid of stuff around the house. You've been doing this since 2020.
It is ultimately up to you how you wish to declare this but be prepared for the IRS to question it. If answering the questions in the program is looping you back to SE, maybe that's how you should be reporting the income.
