The manga is totally stopped even in Japan, I suspect that:
1) it wasn't well received and got cancelled, fully possible, the MC wasn't much, the world is a normal isekai, nothing worth of note or that catches interest
2) the artist and author couldn't work together, the MC was originally a fat dude, it was a important part of the plot, in the manga the artist made a normal adult man, with a good physique and a nice face, is totally different from the one in the novel, I guess that after being forced to actually read the WN he tried to fix the mistake and add weight to the protagonist, but it was really done badly. I think everyone noticed how strange the body change was
3) both of the above