Based on this product's specifications, here are some alternatives and similar models
Phone back case Riff for Huawei P Smart 2020, TPU, dark blue
Summary description:
Back case by Riff designed for Huawei P Smart 2020, made from flexible TPU in dark blue. Provides protection against scratches, minor drops and everyday wear while preserving access to buttons, ports and camera cutouts. Slim, lightweight design keeps device profile slim and enables comfortable grip for daily use or travel.