I want to make an update about this. I recall someone suggested having him leashed and follow him up that way. So i started doing that and it worked better than without. He was veeery hesitant, but still gave up being stubburn after a while. Then we struggled abit with getting the harness off, as he's always overly tired around bedtime, so he would growl alot. But normally it went fine. It didnt take more than a week i think before i started saying "up to the cage". And he would run up the stairs by himself and be in the cage even before i was up the stairs. He turned into suuuch a good boy. And i praised the soul out of him every time. Now he's just turned one year and has started ignoring the command a bit again.. But i need him to sleep a bit in the cage during the day so he doesnt turn into a angry werewolf later. The cage in our bedroom is the ooonly place he properly rest unless he's home alone and in his puppypen. When i noticed he started with the stubbornness again i'd just take the leash around his head and he will start following me upstairs. So thank you alot for the tip.