First priority I would say is to convince some lords to join your faction. Make sure you have some land to give them, or they'll grow to hate you very quickly. If you can spare any of them, your companions can be raised to the rank of lord when you speak to them. However, it's better if they were noble-born like Alayen or Rolf, because other lords won't like it if you raise a peasant like Borcha to be a lord.
Since it seems you've already weakened the nords, I'd say finish them off and try to be nice to the other factions for now. Don't break a truce though.
After that, I would recommend grabbing some Swadian land before it's all gobbled up.
Also, Try and destroy the Rhodoks as soon as you can. In the late-game their castles become absurdly hard to capture, as they're filled with sergeants and sharpshooters and taking them is very... messy.
Try raising your right to rule. RTR is increased by sending companions on missions for it or by making peace with a kingdom.
good luck.