Expressing that anger is one way to deal with it, sure. Ideally, you aim for some form of expression that does as little damage as possible.

Fundamentally, long-term anger is just your brain telling your brain to stay angry. It’s thought patterns in your psyche. You can just let it go. Change your thought patterns. That’s a different way to deal to with anger. I’m not saying it’s always easy, but It’s an option available to all of us.