I tried it with two gradient overlays, but the result is just white
Any suggestion? Thanks in advance
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You can use Gradient overlay. Make sure all your lines are grouped or they are part of one layer.
Then right click (or from fx button) over your layer or group (your artwork), select Blending Options and use desired gradient overlay, like this:
Alternatively, you can create a new gradient layer and use clipping mask.
If you want gradient over your background, same techniques will work. Just make sure the gradient effect is applied and is shown under the layer name (highlighted by yellow arrow below). Also cross check the opacity of your grunge-wall-texture layer. It shouldn't be 0%: