Sorry, but that's a dumb take on this, if you think he hates playing Thor. If anything, his arc since Ragnarok has rejuvenated his interest in Thor, and may be the reason why it's possible we'll still have more of him in the future MCU.
He spent four movies playing the exact same character and he was ready to quit until they finally made Thor one of the most interesting of the main Avengers.
I see so many people walking away from Endgame with the notion that "fat Thor" was just a visual gag for some laughs. And while they definitely played fun with it, Thor's physique is the ultimate statement on how low he's been brought by recent events.
In IW, we saw him on the brink; he'd lost his mother, father, brother, best friend, had to kill a sister his father had lied about, lost his home and nearly all of his people. He went on a last-hope quest to kill Thanos, and failed at the crucial moment. And THEN, they hunted Thanos down to reverse the snap, and THAT failed too.
He was broken. He had given up. That the actions of Thanos had crushed the spirit of even the mighty Thor was a testament to how devastated everyone was. But it's when heroes are down that they have the most interesting opportunities to grow and to change. There's nothing fun about watching a character just always win.
You can dislike Thor's representation in Endgame if you want, but dismissing it as simply a "gag" is a disservice to a fantastic performance by Hemsworth over the past three movies as the Avenger that has lost the most, and in a way has the most redemption to gain by finally defeating Thanos.
TL;DR= Endgame Thor is day 1 preorder for me if they do it.