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Maybe you would write another #introduceyourself post, editing the tags of the post has not the same effect.
For #photography on Steem, try the app APPICS.

Should I delete this one or I leave it?

Leave this one (maybe remove the tag) and change a bit your new post. See https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet for formatting the post.