Do I adjust the Z gap with the calibration?

So it turns out the main problem was i wasn't using supports but I tried with supports and it still could use some improvement. I'm using an Ender 3. Where do I check the extrusion width? My initial layer speed is 20mms.
No raft being used.

My support settings are Tree, touching build plate, support angle 45.0, pattern - zig zag, support density 0,

Here's a similar file that I printed recently, better but still could use some improvement.small sized 3d print pic.jpg