take solo leveling for example. especially with anime adaption, people were VERY hard on how specific they wanted the artstyle, because it was well received. if they changed the Mangas art midway through not only would they probably receive a lot of hate it probably wouldn't have stayed as popular.
at this rate start from the beginning and start over with that artstyle. (keep this version out though cause, I gotta look at it beauty once in a while lol) can't just create a masterpiece and then expect people to receive it well and just continue reading. (I have read a manage where they did this, not only is it easier to adjust to rereading, but artist do things differently and the story can change a bit cause of that)
I fell in love not for the story (sorta for it, i just liek psycho characters)but cause I'm a sucker for hot characters and older artstyle was more my type, this one just don't scratch that itch. and I was hyped too. I only got through to reading half way before I couldn't stand it :(
it's not a bad art style, it's just after reading something that you liked the artsyle for only to see it downgrade ruins it, now if it started with that artstyle that'd be different.
to me this is like when artists change the main characters hair like they got a "haircut" and the hairstyle is absolute crap. that's what this feels like rn