IMO, only real actions, like tutoring minority kids, matters. You can "advocate" up, down, left, and sideways, and it will make not one whit of difference.
I have had moderate success speaking with political representatives at local, state, and federal levels on these issues. Beyond that, campaign contributions to those who support these efforts (maxing out FEC contribution limits). Public policy changes are operating at scale (for example, over a million felons who have served their time in Florida have had their right to vote restored, which matters quite a bit).
Advocacy is work, and costly.