This is actually a difficult one, and in the end only you can truly decide what's best for you and your comic, but I'll try to advise as best I can.
In your case, I can definitely see why you'd want to restart, I jumped back from the current page to the first and wow, yeah that's actually a very big improvement in... like everything, the art looks a lot better, the integration of backgrounds is better, the pages look more complete, there are proper panel borders... It's just all round a more confident and finished looking comic. I wasn't expecting such a big quality jump, so I was ready to give the answer of "Oh it's normal for a comic to get better art as you go, just leave it", because usually, for the majority of cases, artists who start redrawing old pages (which aren't usually nearly as poor compared to current ones as they think) end up in a cycle of redoing old stuff, then catching up and then their newer pages look bad, or you have a weird sandwich of great looking redone early pages, great looking new pages and then kinda eeeghhhh looking pages in the middle!
I think for you, the thing to decide is: "What am I drawing this specific comic for?"
Option 1: This comic is something you're drawing as means to improve your work so that you can draw better comics in the future based on the skills you are learning here.
If this is the case: DON'T redo your old pages. Just keep going and keep improving, then make a really great, consistent comic later. You're clearly in a growth period as an artist, and riding out that growth a bit longer won't do you any harm.
Option 2: This comic has a story and characters you want to make money from eventually, but you're open to the idea that this may not be the final, best version of it that you'll make to print/sell.
If this is the case, DON'T redo your old pages. Keep learning until you feel ready to reboot it in a super-polished, awesome form.
Option 3: This comic, and this specific version of it whether you're making it to turn a profit or just for the fun of making it, is your only comic and you are married to it for the long haul. You have no interest in rebooting or in dropping it and starting anything else.
If this is the case, it's up to you whether you redo your old pages or not. I still think new content is more valuable to readers than more polished older content, but on the other hand, more polished early pages might help hook new readers soooo.... I don't know?
Option 4: You have almost finished the story of this comic and intend to wrap it up as a complete thing, maybe even do a printed edition.
If this is the case, redrawing the old pages becomes a bit more viable, (but leave it til the comic is finished) or you could even leave them in their old state on Tapas and redo them for the printed version as a special extra!