Read up on the Winter War. Finland succeeded in repelling Russia with less personnel and materiel. Ukraine needs to be more harsh with Russian occupiers and inflict devastation on them (which they're currently doing). Western allies need to provide Ukraine with more technologies to counteract the cowardly missile and drone attacks and more lethal weapons. Putin needs to be put-in his place.
If it were me, I'd be reinforcing military positions in Europe and across the world to send a message and re-establish the US military might. I mean we're spending hundreds of billions on defense. Let's put it to good use.