Ah, writer’s block! The bane of everyone’s existence!
My biggest tip for a beginning writer tackling a longer work—and this helps with both writers’ block and getting characters mixed up—is preparing and outlining rigorously beforehand. I find that flying blind by the seat of my pants (“I’ll figure out what happens in the story as I write it”) is the #1 way to encounter writer’s block, because eventually you’ll hit a part where it’s not fun to get from point A to point B, or you’ll get confused, or you’ll realize you’ve written yourself into a corner and will have to start over from an earlier point. Then you step away from it and can’t find the motivation to start again. It’s like going on a road trip without a map or GPS. Eventually you’re going to stop somewhere in the nowhere of the country, scratch your head, and go, “okay, where the hell am I??” You’re going to stop at a gas station and buy a map. So why not have it with you from the get-go?
So, yes, outlining the story beforehand. I take it a step further and bullet-point every single thing that happens in the story, beat-by-beat, so that if I ever lose steam or get confused or come back to it after a while having forgotten what I’m doing—I’m never lost. I’ve beaten writer’s block so many times by simply referring back to an outline I made of the work in its earliest stage and either going “oh yeah that’s where I was going with this” or “oh there’s a really fun part a few chapters ahead, I’ll skip to that point and come back to the rest of this later.” Have an outline to keep you grounded but don’t be afraid to let loose, experiment, and write ahead when you need to!
This method doesn’t always work with people—many writers like surprising themselves with where they take the story—but it’s always what I taught my students and I’ve never had any complaints.
My number #2 biggest tip for new writers—and it may be controversial—is to maybe avoid sharing your work with others too early. So much changes between an idea and the execution of an idea, but writers often feel obligated to stick to plan A because it’s what they’ve already told everyone about and people got excited for this character, so now you feel like you have to include this character even when you really want to cut them out. Or the pressure of keeping up with reader demands (either in producing content in a timely manner or executing content in a way that makes everyone happy and keeps the work popular) causes the act of writing and creation to become a chore. And we all hate to do chores—when we start perceiving writing that way, we don’t want to do it anymore. Boom, writer’s block.
Last but not least: know your characters and world and have confidence in them. We teach the iceberg theory in creative writing class: the idea that the reader only sees 1/8 of the world and plot of the story, but the writer must know all of it—the gargantuan complexities beneath the surface, in the hidden depths.
“If a writer of prose knows enough of what he is writing about he may omit things that he knows and the reader, if the writer is writing truly enough, will have a feeling of those things as strongly as though the writer had stated them. The dignity of movement of an ice-berg is due to only one-eighth of it being above water. A writer who omits things because he does not know them only makes hollow places in his writing.” —Ernest Hemingway
It’s okay if your characters across works share similarities with each other, just as it’s okay that your two best friends share similarities with each other, or your siblings or your parents do. Similarities are inevitable! You can’t make every single character completely unique. (Case in point: most of the Apex Predators characters share traits with the Shepherds of Haven characters.) Don’t let fear of their similarity hold you back from writing them.
The question is: how do we get to know our characters and worlds so deeply, to the point where our minds encompass the 7/8s of the iceberg not shown?
This takes practice. I’d recommend trying out character sheets and worldbuilding questions and mind-trees to spur your knowledge and force you to answer and “know” things—answering questions here on Tumblr really helps too—but the former is how I got started, a very long time ago, and it might help you, too!
A character questionnaire
An extremely long and detailed questionnaire
Patricia A. Wrede’s world-building questions (used by many modern sci-fi and fantasy writers)
Important plot questions
The Mary Sue Litmus test, which is no longer endorsed but still kind of fun to take, and its more modern “does my character work okay?”
These won’t take you all the way, but hopefully they’re a start. Good luck!