Probably have better luck to compare my current art with my art from a few years back. Since I started my comic around the start of May, the series' been only running for roughly more than a month, and that is certainly not enough for a style changing from meh to better. I believe my art has been quite consistent, what change are probably the way I panelling, typesetting, and also the angling and posing of the characters because I noticed my habit of drawing bust-up in a lot of panel ;;;
Yes, it is very natural, it comes as you develop your art style, nothing to freak out about.
IMO, never, ever, redraw. Like seriously LMFAO. If your plot is interesting, your reader will stick with you. They can skim over your art in the later chapter to spot the improvement. Maybe you can check out Noblesse, one of the most popular webcomic from Korea's Webtoon. The art's style took a drastic change for the better as the story progresses. You will know just by looking at the art from the first episode compared to the latest one. It's amusing for me to reread the episode to see how much the artist's style improved.