In my experience, it's almost never fruitful to go back and redraw the first few episodes this early in. You should be focusing on continuing your story, more so than anything and once you complete the comic, maybe then consider going back and making edits.
Part of the appeal of webcomics is not only the fact that you watch the artist and art for the comic grow in real time, but also that the comic updates a little each week or month and you get to stay invested over a longer period of time because of that. (There's also an idea that folks get attached to that original product-- think about how angry people were when the original Star Wars was re-animated over with new nonsense... it's a bit like that. Even if you think your product is humble, folks will still get attached.)
I see a LOT of folks who "restart" their webcomic like 5, 6, and so on many times and never get past a certain point because they're obsessed with ALL of the art being consistent-- which just isn't possible for a one person team and tends to slow down products. I think just continuing forward is best! Having your comic actually get done is worth more than any super polished art, imo.
That said, going back and making small edits like making bubbles more readable or adjusting text or fixing an inconsistency usually feels fruitful because it improves those older episodes without you having to put in like, A TON of extra work or interrupt your current update scheduale. But even now, your first episodes are perfectly readable, I see no reason to go back and edit them.
Your art will always be improving an changing, there's no reason to keep going in a loop trying to keep it all on and up and up, moving forward and continuing to update is the most important thing for webcomics, imo.
That's just what I've observed and dealt with though, take my advice with a grain of salt. If you feel passionately about remaking the pages and you feel like it'll be fruitful for you-- then GO HOG.
Good luck!
