I'll agree with others here. Your traces are too narrow, especially on power and GND.
Copper is good, copper pour your boards, allow floating pours if not much copper is left on the net grounded pour. Then go back and use vias to tie the pours from one side of the board to the other side where you can.
Another trick is to take vias and every x spacing in creating a grid that ties both sides of the board gnd together. Thus further stabilizing your ground plane.
Good luck.
Regards,
Mark
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