There is some way to go however it is clear Russia cannot defeat and take the whole of Ukraine through conventional means / on their own. So what options do they have?
Convince others to join in allowing them to open new fronts - Belarus the obvious candidate, but why haven't they done so already.
Go nuclear. Still a possibility, but will tactical nukes provide an advantage? Warning shot then a threat to take out entire cities if the Ukrainians don't surrender in entirety.
Drop back to defensive positions and hold for a year, whilst rebuilding forces and equipment. But do they have enough to hold what they have, and where do they get moresoldiets and equipment from.
Try and freeze Ukraine out over the winter by attacking civilian infrastructure. Judging by what we've seen so far the Ukrainians have indomitable spirit, whilst if military equipment manufacture is impacted there is still significant
flow from Nato and the west.
Keep the whole thing going for years but at what cost to their country for decades.
In reality it looks there's only one thing they can do. Negotiate a ceasefire, they'll need to hold onto Crimea so they can somehow wrap this up as a victory (they invaded as they knew Ukraine was making plans to attack and needed to secure it), other areas of Ukraine will be returned with all Russian militia removed and UN peace keeping troops sent in.
And what do Ukraine want? Crimea, everything but Crimea, everything, a little bit of Russia, revenge?