Just by posting such a genuine question you are already helping, it certainly made me feel a little better.

In general I would say, keep educating yourself, if a BIPOC person says something you dont understand or even dont agree with ask them why they feel that way. Stand up when you see racism and bigotry, in real life and on social media. Educate other people, whether its your slightly racist older relatives or a friend that arent as educated as you.

I think one of the most important things you can do is to admit that you dont understand, there will be certain things that you just won't be able to understand not having lived your whole life being treated a certain way and its totally fine to admit that you dont get it, if anything that can actually be really supportive.

You seem like a highly intellectually and emotionally switched on person so I think you know the basics already.