Since this is just a draft, you should change #2 to just "think before you post".
It can make sense in certain circumstances, like in BLM rallies telling white people that it wasn't our stage to speak makes sense, but telling people of a certain skin colour to "post less" in general is racist as fuck.
Point 2 is exactly why it is being down-voted. A post about how the Fediverse is toxic to one race/skin colour shouldn't be telling people of a different race/skin colour to "post less".
Discrimination based on race isn't welcome, no matter who it's against.