Activate Multiple Layers Using Keyboard Shortcuts

Try this Photoshop keyboard shortcut to activate multiple layers in your Layers Panel.

Press Shift Alt [ (Windows) Shift Option [ (macOS) to activate the layer below the currently selected layer (or the ] key to activate the layer above).

You can keep adding to the selection one layer at a time by tapping on either of the bracket keys while still holding Shift and Alt/Option.