I personally wonder what would happen if you weened off of dexamethasone, started somewhat high dose papaya leaf extract, and then pulsed dexamethasone (40 mg for 4 days in a row) as needed. This "requires" no ween when its a pulse. You do feel lousy and maybe potentially unhinged for 3 days though, so that could be bad.
Of course I also personally wonder if your doctor has an agenda about/against papaya leaf extract. I do admit that even my use of papaya leaf extract is not the steady result that anyone really desires, so far. But, that is avoiding dexamethasone. I think if I caved to dexamethasone more often, I would be steadier. I'm on last day of pulse right now, since my lack of it caught up to me after months without. Hopefully the condition doesn't get harder and harder to treat.
As far as something else, I guess it could be Retuximab, low dose 100 mg. or bio-equivalent, or high dose.
pmc.ncbi.nlm.nih.gov/articles/PMC8514896/
A good study that delves into the dexamethasone, too. I need to read it more closely, myself.
Guess what? Everything's a guess. I'm my own doctor that doesn't have an agenda against papaya leaf extract, although I may have an agenda for papaya leaf extract. Everybody likes to keep their favorite for as long as they can.

Your doctor may show disdain for the papaya leaf extract. You tend to be on your own to some extent, and that scares some people from using it, I bet.
Is your doctor guessing? I think so. ITP, the guessing game. You will feel good while pulsing dexamethasone, but the rest of the time, so-so. This is a science project, similar to the athletic stuff that we have both done before, and we're not through with (the athletic part, I mean, we're not through with). Of course, we're not through with the ITP, either, are we? No, we're not. Sorry its hitting you at your late athletic peak.