If you're not getting a response, maybe you should consider your written copy for the posting.
Survey recruitment is just as much sales as anything else. You need to really put things in a client-focused way and make sure that the brand comes through as something they want to engage with.
My previous work with survey development and recruitment always made me feel like I was begging people to help me, but it was holding me back. When I was asking people to do surveys, I wasn't selling the interest in why I was there and why it mattered.
If you're selling someone a product, sure, they're giving you money, but you want to focus on what you can do for them. In this case, you can make sure that the products are suitable for them, you can give them someone who connects with their interest, and they have a chance to get good quality merchandise in the process.