Short of a straight-up receptor site inhibitor, I cannot think of a truly good treatment for this illness.
From what I have read so far, it can do a number of very bad things in your body, and interfering with the processes that lead to those bad things happening have other, equally bad things that will happen--
For instance, one of the bad things that can happen is a cytokine storm, which is basically your immune system going batshit kookoo after mass cell death. Under better conditions, you would want to isolate the patient and bring the immune system under control with suppressant medications--- but---
Another bad thing the virus does, is DIRECT tissue damage to alveoli-- the little sacs in your lung tissue that actually perform gas-exchange. Suppression of the immune response to mitigate the massive collateral damage of a cytokine storm would result in this infection running roughshod all over the patient's lungs, rendering them too diseased for continued function...
*IF* it existed, a receptor site blocking agent (To prevent viral adhesion, and thus slow or strongly disrupt viral infection spread in the host), along with immune suppression to sane levels, could help such patients-- but we don't have such a product yet.
The logical best treatment at large, would be wide-spread vaccination to create "hostile hosts", and thus reduce R0, coupled with receptor site blockers for acute ICU patients. Best estimates place those at 1 year away, with heavily rushed trials that are going to be dubious, because of how rushed they are.
People do not understand what this shit is, and do not understand why this talk of re-opening the economy is just fucking madness.