Introduceyourself tag was created so new members can use it to introduce themselves to the community, but you can't introduce yourself over and over again (and especially not with more or less the same or similar kind of post). You introduce yourself once!
Multiple usages of the tag are considered as spam and abuse. You are lucky not being spotted by introbot regarding that tag abuse.
However, I would suggest you to start reading from Quick Start Guide from the Steemit Welcome Page if you skip it at the beginning, maybe being too excited to start posting ASAP.
After that, give yourself time to go through Steemit FAQ which is quite comprehensive about the whole platform including what is acceptable and what not.
Another good read is also Steemit Etiquette - although somewhat older post it's a great summary of Steemit do's and don'ts!
But you know that my favorite character is cool :).