Create a new layer again and use on it the earlier applied instrument, Pencil Tool (B) (brush 1 px).

Make several copies of the last created layer, placing them the same way indicated next image:

The majority of the copies have the same parameters of the layers, demonstrated below: Blending Options>Outer Glow

Blending Options>Color Overlay

Blending Options>Gradient Overlay

Gradient’s parameters:

The rest of the layers have the next indicated parameters: Blending Options>Color Overlay

Create a new layer and use on it this time the Brush Tool (B) (Opacity of 30%) of the color #FFF799 to introduce the illuminating effect on the text’s letters.