Today the tracing programs have not reached the dumbness level of Dall-E, ChatGPT, Stable Diffusion etc... so they try to guess in a simple way what your noisy and blurry original might contain. The programs follow their programmed rules which do not try to make further guesses based on all available internet content. You even have no place to input "Only perfect curves for me, please!".
You must either trace it manually to get what you want or edit the automatic tracing result. Here's one result and few edits:
On the top there's your original. The 2nd is the raw tracing result. It was got with the default brightness treshold and edge smoothing. The original already is highly asymmetric even in the left half. But Inkscape is not programmed to care.
In the 3rd version the hole is changed to a shape. The hole comes from a combined path. It's broken apart, the group is ungrouped and the outer rectangle is deleted. This is what remained.
The 4th version has no fill, a black stroke is inserted
In the 5th version a few vertical lines are inserted manually to show one possibility to insert manually some details you might want. The new lines have round ends and they start and end at the centerline of the edge stroke. They snap well automatically if you draw them by clicking only with the pen, hold Ctrl as you draw and have snaps ON.
If the left half must be symmetric you can split the curve and duplicate & flip the part which should be symmetric. Here's a couple of screenshots which show the achieved vertical symmetry. The flipped implant is selected:
Probably you want to remake some finer details, too. I skip it.
You can insert gradient colors if you make at first colorizable closed areas. The shape builder in current Inkscape is the perfect tool for making them.
Late addition: As you can see, some high reputation members would draw this shape manually either by doing it from scratch or by tracing it manually i.e. drawing on your original. They wouldn't waste a second to clean the inaccuracies of the automatic tracing result. That's no problem for persons who have years or decades ago climbed up the learning curve of drawing and editing Bezier curves. Aim the same. This shape is so simple that working 1...2 days through some Bezier curve drawing and editing tutorials makes you wonder "How in the hell I didn't start by tracing it manually".