Based on this product's specifications, here are some alternatives and similar models
Silicone back case Mocco for Xiaomi Redmi Note 9T — Black
Summary description:
Soft silicone back case by Mocco designed for the Xiaomi Redmi Note 9T in black. Protects the phone's rear and sides from scratches, minor bumps and dirt while maintaining access to ports, camera and buttons. Lightweight, easy to install and remove, suitable for daily use to preserve the device appearance and grip.