OOOH! Rain would go very well on Tapas which was designed for single-page uploads, although the more successful webtoons update whole chapters at once, so unless Jocelyn plans on uploading once every few months, I don't see Webtoons working out terribly well.

The main reason WebTOON wouldn't work is because of how the Canvas/Originals system works.

While Jocelyn has enough of a backlog that she could possibly post her work on Canvas and have regular updates for a few years if she had someone who would be willing to reformat her pages to long vertical strips as opposed to comic pages. I don't know if some of the panels might need to be redrawn for legibility.

There are some artists that post shorter "chapters" that equate to a page or three of Rain, and break their stories up into "seasons" which would be equivalent to current Chapters.

The downside is that most of the artists on WebTOON hope to be tapped for "Original" status, which has some pretty strict contractual requirements in exchange for more monetary gains. Often Artists end up redrawing their whole series if this happens.