Hello @ZechRandle3 ! Hope you don't mind me answering here but my comment wouldn't post. Maybe it was too long, so I figured I might as well copy it here and answer your question!

What you're having trouble with is actually very common! It used to be a thing I struggled with when I first started writing, because I also had important scenes in mind that I knew I wanted to write into the story, but I had no clue how to get to those scenes. In my head, the characters were there—just like you have them all planned out too—and I could see them playing out these scenes and it was great! But that's actually one of the issues; we know and love these characters, but the readers don't.

So then, to make those scenes really pay off, we need to make the audience care about our characters. Those in-between parts you're struggling for are there for that reason. Before we get to those big, emotional scenes, we need to establish who these characters are, what their relationships are, and what motivates them.

What I like to do is take a moment to think about what information needs to be passed on to the reader before we get to that scene for it to pay off. Let's say you have a scene where a character dies. Before that character dies you have to give readers a reason to care about them, so you need to develop them, show who they are and how they interact with others. You need to give that character value and purpose so when they're gone the effect is felt and you need to build them up and get readers to know them so they feel something when they die.

I recommend sitting down and writing out some questions to figure out what you need to accomplish in the space between the scenes you have planned out.

What purpose does the scene have?

What are the stakes the characters are fighting for?
What motivates your characters both in the plot at large and on a more personal level?

What background information needs to be revealed before you get to the scene?

Who plays a part and are they developed enough as characters?

What changes after the scene, if anything?

Just those kinds of questions that help you get a clearer picture of where you're going with your story. Once you have a better idea of what you need to do before the scenes you have planned out, think about the best way to deliver this information without it feeling like an info dump. Maybe your characters are on a journey and are sidetracked by a small stakes conflict that brings them together, makes them reveal something about their past, or shows a new aspect of the world they're in. Or maybe they just have a conversation over tea that reveals their inner thoughts about certain characters or aspects of the story. It really depends on what you're doing with your story and how you want to frame things.

If you want, you can also examine some shows and movies you like to see how they do these things. Pay attention to how events sort of have a domino effect where one thing leads to the next until we're at a key scene. You can also look at different writing structures to help you plan things out.

For example, if you look at the three act structure that is most often used in movies, you can see how the middle part—which is what a lot of people struggle with—is all about building up the tension and the stakes. This is the part where characters are built up and finally grow to the point where they can face the main point of conflict. Often, you have a lot of smaller conflicts that tumble along until you get to this point, as a way to gradually show the character development.

Those are just some things you can try out, but ultimately, you have to find what works for you. Maybe you just need some time to relax and think over your story. Sometimes, the answer to that kind of issue can come to us out of nowhere. Either way, I hope this helped and I wish you the best of luck with your story!