Sore Losers of Lemmy: What Helped You Start to Lose with Grace?

EDIT: Thank you all so much for your thoughtful input. It means so much to me.

Hi, all. I'm looking to change my nasty tendency to be a sore loser, particularly when playing games. I tend to personalize losses that are of no consequence. When the game starts to shift against me, I often stop trying as hard because it feels hopeless. My partner is much more proficient at board games than I am, and I don't want this toxic trait of mine to make games less fun for us. What are some things you all tried to lessen this train of thought, if you've experienced it?