All 3 together. However, I believe you can save yourself some money and spare your body a little bit by having bloods checked.
It could be as simple as just getting estrogen lowered. Other times all 3 may be the best course of action.
I'm no doctor so it's just experience and research.
Discharge is a fair pointer to prolactin.
So I would target that if it was me. That also means lowering estro. For existing gyno (not preventing it) I always use both Ralox (or Nolva) and Exem.
Here's an example: i increased my test dose and added Tren to a cycle. Then my AI ran out (I thought I had one more bottle) so by the time I got more it was over 2 weeks. Gyno flared up and then prolactin kicked in. Slight discharge from one nipple if squeezed. At that point AI wouldn't help alone so I added all 3. Nolva, Exem, and Prami. Patience is virtue here.
Erections are better and last longer again and I can finish in a sensible time. Discharge has stopped, lumps are much smaller and not hard anymore, nipples are tighter/smaller and no more pain.
Took about 2-3 months.