In order for the table lamp to look proportionate to the table, it’s likely you’ll need a larger lampshade. To change the lamp shade and ensure it sits at the proper height above the table, remove the existing harp.
Ready-made lampshade harps may not be tall enough to support your new lampshade. In order to ensure it sits at the right height, screw a riser to the top. Risers are often found in 1/2”, 1” and 2” sizes