You can enter recovery by powering off your device then holding the volume up, Bixby button, and then pressing the power button, until the splash screen lights up, then let go of the power button while continuing to hold down the volume up and bixby button, you may get a screen that says, no command, it's okay it will go into recovery, once you see the recovery screen, or the, no command, words comma you can then let go of the volume up and Bixby button. Then use the volume up and down to toggle to the, clear cache partition. Then use the power button to select, then power button to reboot the phone.