Hi the link below is good information about posting in different communities. It's called 'cross posting'. It's something I've never done before but I believe if you post in say the 'photography lovers' community you can then find another community that is similar and cross post it in there, for example, the 'photography' community. Although, you need to check the rules of each community. You only get upvoted for the original post though. I think you have to decline payment when you cross post it into another community.

If you look at this link, scroll down to the cross posting bit.

@erikah/cross-posting-and-reposting-explained-using-peakd