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"everyone treated the only likable character like shit the whole time"
That's a big part of the story.
"It could’ve been done better as a 30min short, so many scenes were way too long and just pointless. "
I don't know. I thought this made it more agonizing given you knew something bad was going on. This movie made me more  uncomfortable than Hereditary (which you are right is a masterpiece).
I don't remember ever watching a movie as thoroughly predictable as Midsommar.  Every scene of the movie felt like I had written it myself, it was just that "expected" >

The plot is painted on the inside of the church, they show you the plot in the movie unless this is /s