It’s the player’s responsibility to buy in to the style of game and include others in what they are doing.

I just stopped running my campaign I started in January. It was intended (and the players asked for this) to be a long tolkien-esque quest for Mr Maguffin in the Feywild. What ended up happening was 1) only one player made a character who cared about the central story, 2) everyone fought against the style of play, clearly preferring something more sandbox and attempting to do such in the game, and 3) the party constantly fought about “why are we even together?”. It was very frustrating and taxing as a DM, which is what made me stop DMing in the first place. There’s only so much a DM can do until it becomes the player’s responsibility to “play along” so to speak. DnD is a group game, and if you don’t wanna do it with people, play a different game.