I am new to 3D printing. I have an STL model for a 2.5" medallion I want to print on my Creality K1 (1.75 mm PLA filament through a 0.4 mm nozzle) via Creality Print 6.1. Speed and temperature settings are defaults (220 °C nozzle, outer wall speed is 200 mm/s, 0.2 mm layer height). When I print, I get visible filament lines on top surfaces and most of the detail is lost to visible layer steps. Can I improve on it, and if so, how?
Below is a rendering of the STL file in FreeCAD:
Below is what I got.

