Could you improve/totally get rid of bow legs?

Yes. In adults, bowlegs are usually due to arthritis and can only be corrected surgicially. In children, there are nutritional and developmental defects that can sometimes be corrected with nutrition or bracing.

Related Questions

If I try to walk differently, can I get rid of my bow legs?

No. Walking differently will not change the structure of your tibial bones.
No. Bow legs are due to bone shape. Changing your gait will not have an effect. If they don't hurt, leave it alone.