Cramping it all on the userpage comes with certain limits. Revamps are basically personal takes on already official pages. Fanfictions might (Emphasis on “might” since this is a wiki platform, not an app for personal works.) be interesting enough to warrant sandboxes despite providing no benefits to the website. Definitely feeling insecure and uncertain about all this.
Topic on User talk:GojiraBoy1000 T
There are other options like Zilla Fanon Wiki and FMK Wikia where you can cover all the facets of your fan fiction, but this is not the place. Putting them on your user page is basically a loophole because I'm not gonna tell people what they can't put in their own space, but allowing people to make sandboxes for these things is just unneeded bloat. I could see posting the text of fics to the forums for others to read, though.
"Revamps" sound fine to have sandboxes if you actually intend to make the changes to the existing pages. That's already been done with things like this or this. The only things I see on your user page right now, though, are split-up pages for the different MUTOs and Skullcrawlers, which I frankly see no point to.