To explain the downvotes a little further since you are fairly new here.
We don't like people posting the same post twice this is seeing as double post which means double rewards and peopæe shouldn't be reward twice for the same content on Hive.
Here is what you can do instead, if you use the interface Ecency or Peakd, they have a feature where you can crosspost your content into other communities without double posting and thats 100% allowed.
You find this feature on the 3 "..." Dots of your posted post :D
I hope this helps, otherwise feel free to reach out and ask for help! :D