Part of the advantage of this site is that you can get returns, feedback and suggestions from readers between your chapters. Trying to finish a story before even publishing it thwarts that.
There's also the fact that if you publish a whole finished story as one go, very few people will see it because there won't be updates.
I'd say pick either the one you like the most or think will be of interest to readers/writers. Then remove the last three chapters and publish it. Add back the three chapters along 2 or three days and see how it goes.
As for lack of inspiration I noticed that trying to work on stories with different point of view and tense at the same time makes everything a lot slower, so maybe try to focus on those with the same.
While stating the advantages of this site as the ease of gaining feedback or comments is, in reality, not necessarily as big a bonus in practice as it is in theory for most of us mortals - publishing your works as less finished versions of themselves, and re-adding chapters, is truly a quite ingenious take on your problem. You could slowly trickle in your stories and see if 'likes' or inspiration or *another's inspiration* hits.
This is a great idea for someone in your position.
Unless it would really bother you to have "unfinished" stories in your profile: Publish!
Of course nobody knows if another author will ever continue one of these stories.
But it is possible.
I personally joined chyoa so that i could add to a story that wasn't very well developed.
I think that TheDespaxas as well wrote something along those lines as his reason for signing up. (I hope that my memory is accurate!)
Surely there might be a few more people with a similar history.
Also true. And as an aside - I dont know what other authors do, but I don't have twenty stories waiting to be published - I have zero. Including a shit story that goes nowhere and I'm not actively working on (but that I still feel has a foundation for existing, underneath) I published.
(As a side note 'epically overleveled' is an open story. I will continue to welcome all hereto non-existant contributors to it.)
I will offer one additional strategy to try and simplify your problem -
Without knowing your unpublished stories, I might ask you to ponder - are you able to combine some of your stories into one or a few? Like a loose premise or common thread you could use as an introduction, where you might be able to combine some (or all) of your stories?
Purpose being that don't have an (obnoxious) number of partial stories flooding the site and your profile, perhaps (I say this without knowing the nature of your stories, or the viability of this suggestion), perhaps you might group some of your unpublished stories into a single, or a few, themed 'megastories', leaving yourself or other authors able to contribute to their take on the theme of your 'megastory' or (even more ideally) on one of your already established story threads (ie bank of unpublished work) within the 'megastory', without the same format/profile clutter as straight up publishing your current series of unpublished works.
So... That's another thought.