Uh one of the main actors got in shit for sexual abuse, that ended any chance of having future episodes.
Amazon wouldn’t have left that cash cow behind, but there wasn’t going forward with that actor, or even rewriting them.
You can see how they went back and changed the end of the season already filmed scenes to rewrite the cancelation story in.
There was also a massive time shift coming up, it just wouldn’t work.
That is a very fair answer, if not them someone else unfortunately though. It was doomed to get more content eventually.