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@Dragonic7 Here's just some advice I can give on this regard:
1. Create an outline. Make a rough outline of the next few chapters and short descriptions or play-by-plays of what happens in them.
2. Don't adhere too strongly to your outline. If a cool idea comes up and you can find a way to add it in the current narrative, give yourself that freedom. Just make sure that addition doesn't retcon anything or contradict anything, unless it's meant to.
3. Keep a personal Wiki. If you add enough new things to the story, I would make a personal Wiki so that I don't forget important details about characters, like their powers or relationships. This is optional, but it helps a lot.
4. There's honestly nothing wrong with taking a step back to clear your mind. I sometimes go on long hiatus because of writer's block or simply because of life. If you aren't feeling it, then you always take a break until you feel ready.
5. If you don't have an outline and want to get back into writing, just go with the flow. Lowkey, the hardest thing sometimes is just getting in those first few hundred words. But once you start kicking into gear, that's enough to set you on the right track. There have been many times where I didn't know what to write, but I just freestyle it. Most of the time, it ends up being shit, but the point of it was never to publish the chapter. It was simply to warm up. Once I feel refreshed, I usually start over with that chapter now that my brain is in that flow state.
6. Know your focus. Tensura is very multifaceted, and there are a lot of things to focus on. I would try to make a priority list of what aspects my fanfic is geared towards.
7. Don't feel too pressured to explore everything all at once. With how massive Tensura is, how many characters it has, and how complicated its power system is, it can certainly be little daunting. Know your priorities and expand naturally from there.