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Unfortunately, this may be an unrealistic goal. The discharge status is intended to be permanent. While many in the military, myself included, were told that these things are upgraded or can be upgraded after (so don't worry about the discharge status), that's far from true.
To upgrade a discharge, you have to file a DD Form 293 (if within 15 years of the discharge) or a DD Form 149. Those boards have the power to review and upgrade a discharge. That being said, they only do so when you can show that the discharge was an error or an injustice at the time it was given. Positive life changes and the things you've done since the separation are not relevant to their review, because it isn't a merit based concept for them to upgrade. They only upgrade when, in their estimation, the discharge status shouldn't have been given in the first place due to ignoring evidence, clerical error, etc. Their goal is to correct the record based on error, not to improve your discharge status based on your having earned it...which is unfortunate, because I think many people do earn it and if this sort of review was done, we'd see more discharges upgraded....but that isn't how they review it based on the law.
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