Keep in mind that building an audience on Tapas can take a long time, especially for novels. I am approaching the one year anniversary of Wild Nights, Hot & Crazy Days and just hit 83 subscribers. But I made a mistake: I, too, had the whole thing written before uploading any of it, and when I started publishing it I got excited, got ahead of myself, and dumped the whole thing over two or three months. It is not a short novel, either - it is 183,000 words. The problem was that once I had the whole thing published I no longer had updates to offer, so no reason for people to subscribe.
I didn't make that same mistake with Finding Daecon's Way. This one was also fully written before publishing any of it, but I've limited publishing to one update a week except for special features (character bios, holiday specials, etc), which come in between the regular Saturday updates.
My advice would be to start out with a few chapters to get readers hooked (let them binge the first bit), then do weekly updates to keep them coming back.