There's good aftermarket case options for the Apple Watch that might help. I don't own an Apple Watch, but I've always been impressed with Spigen phone cases and these certainly look the part for £20!
Apple Watch series 6, SE, 5 or 4: https://www.amazon.co.uk/Spigen-Rugg...dp/B085FS7VL6/
Apple Watch series 3, 2 or 1: https://www.amazon.co.uk/Spigen-Rugg...dp/B075FJCM4G/