Good news: It's not past time for this to be effective.
Better news: You don't need to wait for a boycott, and you don't need to wait for Black people to tell you what to do.
Best news: You're already doing it! 🙂
The fact that you can read these words that I'm writing, means that you're at some level already making a decision about "Who do I want to make richer with my social media activity? Who do I not want to make richer?"
You make a similar decision every time you shop, travel, spend your time, etc. Even if you don't consciously make a decision, a "status quo" decision is made on your behalf.