Started at a higher weight than you, roughly your age too, and I've dropped 35% of my body weight over 10 months, still moving steadily.
There's a group who only manage 20%, and when you probe into what they're actually doing to keep the momentum going, they usually don't have a solid answer.
If you're staying consistent with exercise, keeping a real deficit, drinking enough water, and taking your medication as prescribed, how would you not eventually get there?
That study showing a 20% average loss never tracked activity level or diet for those participants. Probably just folks who took the medication and did nothing else alongside it.