I'd get it into a carboy. I usually transfer mine before it stops fermenting, but after it slows. 1.010 or lower. Then I know there's some CO2 in the carboy headspace. I let it go until it's definitely done, and let it rest long enough to settle and clear somewhat. Then I rack and add k-meta and let it age, settle if it hasn't, and clear some more if it hasn't. Then 3 months later another rack and k-meta, taking care to observe the bottom of the carboy for sediment or crystals. Before adding the k-meta I taste. If it's mellowed some, I'll consider sorbate and sweetening a few days later. I'm looking to get the wine a little aged before sweetening. A couple of times I've sweetened green wine and had to sweeten too much to overcome the harshness. Then a few months later it was too sweet for my taste. It's hard to guess if and how much the wine will mellow with age.