There's a lot of possible treatment and care options once you're hospitalised. Apparently even putting the patient on their stomach during ventilation helps with recovery when it's at its worst. That's an Italian innovation apparently but I can't remember the reason why it works.
It works for 2 reasons stomach liver ect. are pushed away from you lungs and any fluid build up falls forward help the lungs function with what they have left
or the more technical term...
Prone positioning improves gas exchange by ameliorating the ventral-dorsal transpulmonary pressure difference, reducing dorsal lung compression, and improving lung perfusion
Its not new and was first considered in the 1970's - didn't really catch on until ventilators improved - This is the most wide spread use of the technique but that because there is no other treatment to administer and the patients don't have other medical needs - injuries etc.
Sadly there is very little actual treatment - ventilators keep you alive so you can hopefully fight it off yourself
there are trials going on RECOVERY being the biggest UK one - (Randomised Evaluation of COVID-19 Therapy) its testing various suggested approaches but remember its Randomised - so its down to chance if you end up getting the best treatment
There are other drug trails - the infamous hydroxychloroquine the one getting all the attention but remdesivir is so far the only one looking promising
convalescent plasma therapy is also being considered - giving patient plasma from recovered patients to the sick but I'm not sure about that one