I made a new story and renamed the old as "old version". Of course I lost many subs but I wanted to keep the comments and see my progress (I had around 100 and now I think 40? I don't check that stat really). I made an info post on the old series and those who were interested, followed to the new version. My old story was up since 2016 so alot of subs weren't active anyways, which is totaly ok.
If you don't have major problems that botter you so far, I'd say just edit. It's better to upload new pages than fall into the rewrite circle Or collect the things you want to change and plan like a "hey I'm making a little fresh-up" - event.
I follow a cool webcomic that restarted completely 4 times now. At some point as a reader, it gets difficult, which info is important and which one is old ^^`
(I hope my english was readable).