This is something you’re going to need graphics programs to do.
Get your raster program (GIMP, PaintNet, Photoshop, etc):
You’d import the image to your raster program - outline the part you didn’t want and delete it. Also messing with the contrast can significantly improve an engrave (here’s a video, and here’s text)
Then you’d get your vector program (Inkscape, Illustrator, Affinity Designer, etc.):
Import the edited image into your vector program and add vector lines around the outside - including adding the circle at the top - and around the parts on the inside that you want to fall out. The vector programs will have a “trace” function that will get you going, but you’ll need to do some manual editing of nodes once the trace is done. (here’s a video and here’s text)
It’s not as complicated as it looks - but it will likely be confusing the first few times, and then it will become second nature!