How can i improve my breathing so i can get off supplemental oxygen? i do not have copd or other. i live in high altitude state.

Depends: Some causes of low oxygen can be improved, but others are fairly permanent. Once you have oxygen dependent COPD for instance, it's unlikely to improve. However, if you have congestive heart failure, asthma, infection or inflammation of the lungs sometimes these conditions can be improved with medication and allow you to come off of o2. Living at high altitude also creates some problems. Less o2.

Oxygen: There typically is an underlying reason that you need oxygen-acute pneumonia/ recent surgery with underlying lung issue that was not previously causing problem/ pe, etc. Whatever the underlying reason is has to be remedied and then you should be reassessed.