It is better to not publish your first works in the first place. You are still unfamiliar with the medium so your first attempts are going to be more like experiments than actual work.
That's more or less what I did. NOBODY has even seen the first novel I tried to write except for me. From there, I went on to writing a whole bunch of little mini stories that I shared with another community. That was how I honed my skills. Then, finally, 8 years after I first made my failed attempt at writing a novel that was seen by no-one, I am on an LCD forum thread discussing Death Mage, and some crazy keeps saying "this demands a fan-fic" for every crazy concept or comment somebody makes. I decide to take up the challenge for a few of those.
From this, I discovered my writing skills have become seriously good in the 8 years of practice I had. This is what gave me the confidence necessary to actually make another attempt at a full novel-length story. I started off by posting some of my Death Mage fan-fics, but then I tried my hand at writing a full length novel again and posted it here to ScribbleHub, and I was blown away by how well it did. It's usually winding up in the top 20 or so on the site. Before the trending list metrics were changed, it would even make the top 10 quite often.
This is the kind of training and practice it takes to produce a work like that. It seriously took me 8 years of practice to be able to do this well, and I am still learning new things as I write now.