I'm not a very angry person, I don't really have it in me to be genuinely pissed most of the time. Sometimes I'll get irritated, and I can usually kinda DBT my way through it, but honestly I'm really pissed at my ex. The more I think about everything horrible she did and continues doing, the more I kinda spiral into being pissed and it's not helping me at all but I don't really know how to decompress all of it. I'm rightfully pissed, she did some truly nuclear shit I'd need content warnings for, and having that anger is healthy at some level. But like I said, I need to get my mind off this shit so I don't become a bitter divorced dad lol
Speaking as someone who is both an introvert, and left an abusive relationship; For me personally, this is the kind of thing that talking and venting with other people, out in the wild or in your trusted circle, is for.
Easier said than done if you don't have those relationships already, but whether it's family, friends, that nice neighbour you trust or a bunch of friendly strangers. Human connections helped me massively.
If it's a trusting enough relationship, you might be able to say "I have stuff going on, do you mind if I talk to you about it for a bit?". Otherwise, just relaxing with friendly people and re-establishing what a normal, healthy, happy social dynamic is and bathing in it can sometimes be enough.