Help with Copy-Cat Sellers

I design and sell 3-5 products on Amazon as a side hustle. It’s been doing well, with daily sales of $200-$300 in the last 3 months. I’ve been really proud.

Recently, a Chinese copy-cat account took my product and is selling their copy of my product for a few bucks cheaper (they are using inferior materials which 100% won’t last long-term).

TLDR; Amazon won’t likely do anything since I don’t have a patent on my design. What are some practical things I can do to combat this copy-cat?