Remove the text
Whatever you're doing to it that makes it look so low quality, stop it.
Fill the empty space
add depth
add blending on the render to the BG
There's no FG.
Crop your signature, way too much empty space even if you fill it.
Look, just a crop makes it look so much better.
Remove your border, those are way too oldschool. (Unless it's something like framing)
KIU, Look at some tutorials mang. (I have a thread in the tutorials section)