you can't delete posts. You can only edit them.
you can change tags, all except the first one, so you are stuck with the #introduceyourself tag on the posts you used it as a first tag. But both of your first 2 posts were a introduction, so that I would think is OK.
Not all posts attract a lot of attention, no matter how good they are. I have a few posts with only a couple of views and zero earnings.
Subsequent posts you should use other tags that are relevant to your post. The first tag is the most important, so don't lead with a tag that has a very low rank, but of course it has to be relevant - as you check on postings you will find however that a lot of people are "cheating". Most of my posts are in #art because they belong there, but when I go to art, I find all kinds of stuff that has not even a remote relevance to art. But don't do as they do, do what is right!