My go-to practice for this sort of thing (& I harbor a lot of... how shall I phrase it... "free-floating" anger) is the practice of compassionate abiding. Here's a link to a description of the practice in case you're not familiar with it:

Relieve Distress By Allowing It: Compassionate Abiding 101 | Mindset: Perspective Is Everything

And then also here are links to some articles, from PsychCentral's archives, that offer tips regarding how to address anger concerns:

6 Steps to Manage Anger

Tips for Coping With Your Angry Behavior

Dealing with Anger Constructively

Angry All the Time for No Reason? This Might Be Why

I wish you well...