What is the significance of REV Ch19 vs 1-5 if you are black?

There is NOTHING "sexist" or "racist" in Rev 19:1-5 ...

The first 2 verses do have significance for Catholics.

So do the previous two chapters (17 and 18)

To get the answer to this question you need to understand the context. the "slaves" are not making reference to a specific group of any orientation or color. Rev. 5:9-10 these slaves mentioned in revelation are those who share with Christ during the thousand year rein. There are also other slaves who would support that group who hope to live on earth. So they sing songs of praise as the scriptures mentioned there in verses 1,3 So there is no reference to black people. Just true christians who Praise God.