Whoa. First, it’s neither your fault nor mine that you might be in that 20% of exercise resistant depression. I mean, it’s like a 1 in 5 chance, so not uncommon.

Also, thanks for letting me know that you have tried that; I’m sorry if you’ve told me before and I forgot. I asked because I didn’t recall. I agree that a 2-3 mile walk every day is “enough” light exercise.

I’m not a professional, so please forgive me if my suggestions aren’t professional-quality. Exposure to nature helps some people. You might make sure your diet has enough Vitamin D, very low levels can affect mood. Are you self-isolating, even if you aren’t lonely? Maybe try to have more IRL social interactions; even if they are superficial, good ones can help confirm that not everyone deserves your anger. Also, maybe anger needs more high-intensity work for less time – or maybe resistance training (weight lifting) instead of cardio?

Have you looked into getting professional help?