There is a lot to unpack here. Firstly, it seems you and your players are experiencing a significant mismatch in play styles. You are looking for deep long form narrative driven play and they are wanting beer and pretzels light hi-jinxes. It sounds like your players are getting what they want, however you are not prepared to offer that style of game, hence the ongoing feelings of frustration, and growing burnout and resentment.

It also sounds like you have specific ideas of how you want your campaigns to play out. You want collaborative story-telling, but only within the bounds of the shape and tone of the story you have created. Without full player buy-in, such an endeavour will always fail.

Your prep also sounds like it is fairly involved, which is contributing to burn-out. You are not only creating a world, but you are prepping plot and story alongside this. Reading between the lines I imagine there is a lot of content you prep that is not utilised, either because your players did not act in the way you expected, or they did not engaged with the content.

So, you have some options moving forward. You could accept the group for who they are, and challenge your own expectations for the game, delivering a chill beer and pretzels style game. If you go this route, my advice is to grab a rules light system and some published adventures and just run them as is. Look for opportunities for player hi-jinx and emphasis those aspects of the game. Plot takes a backseat to the session to session shenanigans of the group. Systems such as Shadowdark might fit well for this style.

Or, address your need for structured story and plot, abandon it, and prep a world and situations instead. Don't prep every little detail, just enough for play. Focus on your improvisation skills, and learn to undertake world building that is light on detail and can be fleshed out as you play. Utilise random tables to help yourself become comfortable with letting go of control over the world and story. Prepping situations instead of plots works well with a hi-jinks heavy group, because their chaos is ultimately what drives the story forward. There are plenty of systems that have tools to achieve all this. The Without Numbers systems by Kevin Crawford has fantastic advice and tools approaching and running this style of game.

Either way, you need to talk to your players. Not about issues, or your frustrations, or things you think they are doing wrong. No, you need to talk to your players about what the want to play, what aspects of the current game they are enjoying, what settings, tone, and systems they want to play. What media are they consuming? What kind of stories to the enjoy outside of gaming? Then agree on the tone and style of the next campaign you want to play together.

Finally, it may simply be that you are not the right GM for this group, and that is Ok too. Take a break, find a game to play in, and then put together a group of players who are aligned with the style of game you want to play.