Need shoes for long walks

Hey everyone, I need a new shoe that’s gonna allow me to walk like 20k steps without my feet feeling super sore. I need something with a decent heel to toe drop because my old shoes gave me back and knee pain. I had the asics gel nimbus 27 and they also gave me back and knee pain. I’m not sure what the variable is but I need something that’s good for back and knees as well as has cushioning for longs walks. I’d appreciate your answers. Thanks