Lesson learnt for the future. It's not the end of the world if you forgot to post in a community, just let it be. If you posted in the wrong community by mistake, you may or may not be down voted or muted depending on the community. Just apologise to the community mod so they know its not done on purpose. Or edit your post with an equally quality post that fits within the community guidelines ASAP, but not after you've got a lot of engagement or upvotes on it

Many abusers delete a post so they can milk more rewards, so just be careful in future