imagination7413 is right, better get rid of your duplicate gig, not that Fiverr gets rid of one of those 2 for you and chooses the one with the reviews.
If the gig you say you can’t find in search is one of those 2 which are duplicates, I did find the one without reviews on page 15 when searching for “ebook ghostwriter” with “new seller filter”, so it’s searchable, and you can’t really complain if they only show 1 of those 2 gigs, as it’s literally the same thing save for the numbers of words.
Different number of words isn’t supposed to be done via different gigs (you can use the 3 gig tiers for that, or extras); else, sellers could, and some would, literally clutter up the result pages “for more exposure” (I know, it’s a “tip/trick” you can sometimes read, but it’s by people whose tips you shouldn’t trust because you jeopardize your account by following them) by publishing the same gig for 7 or 21 or however many gigs their level allows them, with the only difference being number of words.
Also, yes, don’t offer “unlimited revisions”, you can check the forum to see why that’s not a good idea at all.
Before you contact support again in case your gig keeps missing, I’d advise to get rid of that duplicate gig first, give things a while to update, and then search again to see if it might not show up then.
Another thing you can take into consideration - some sellers claim that if you have several gigs in the same category, only one gets shown (though I personally can’t confirm that, don’t check on my gigs often, though, either), or at least just one of them on a good spot, so it might be worth a try to see if you can find different subcategories for your different gigs.