So the first point to establish here is: Ukraine are fighting this war based on determination to survive, this is evident by how well the Ukraine army is operating vs a force who simply has no will to fight. NATO are not forcing Ukraine to fight.
Therefore we should continue to support Ukraine, both in terms of ability to defend existing land and reclaim lost territory, the solution and way out of this war is to form a uniform front, punish Russia and make it understand the cost of it's actions and give Russia an offramp.
1. Keep supporting Ukraine with training, gear and money.
2. Continue to spell out to Russia that it will be a pariah state unless it plays by international norms.
3. Continue to ramp up the political and financial costs to Russia.
4. Allow Ukraine to try and win this fight without getting NATO involved in the conflict.
5. Start to set a path forward for Russia, i.e. political change means a slow re-integration into the rest of the world.
6. If Russia crosses a red line, i.e. attacks or invades a NATO country then get involved in the conflict.
Russia entered this conflict based on the opinion Europe was politically divided, relations with the US was poor and due to this we would never come together to appose any Russia incursions.
The above has proven to be one of the largest military blunders of recent history, Putin needs to understand that NATO are willing to go the whole way with this, i.e. nuclear conflict if needed, anything else and Russia will just see weakness and continue to exploit its nuclear position.