There is nothing to be learned from the outcome of a single loss.
You can only take away ideas and theories.
Only when you test those ideas at scale do they give you a foundation to tweak your strategy.
Otherwise, you're making changes based on randomness.
If you want to get better at accepting a loss, start by reframing it in your mind.
Losses are just a statistical part of your edge.
Your job isn't to avoid them, it's to ensure they're small enough that you can bounce back financially and psychologically.