Also, if you have any questions be sure to post them. I’ll do my best to give an answer, though I reserve the right to refuse to answer questions that require me to spoil the story.

In the summary, when you say she plans to manipulate canon, I get the impression that canon is going to change/alter. But when you say she plans to hide her power after getting powerful, I get the impression that she plans to make things go the same way as in canon. So which is it? Is she just going to be one of those unnecessary inserts that's just there to be there, but changes nothing?

She plans to use the canon as a guide to influence things behind the scenes. She'll be scared of drifting too far from it, but every choice she makes will have drastic impacts in the future, which WILL change quite a few key events. I expect the biggest change to be the Namek arc, but the canon will stay relevant the entire time.

Was the mc a guy in the first life? Also will there be any romance? Will it be yuri if so?

Mc’s female through and through. I can’t fully answer the second part of that question without giving away spoilers, but I don’t plan on adding any romance. The distance between her and the other Z-fighters because of who she is, is an important part of the plot, after all.

how does one write fast? and not struggle with it? as somewhat of a new writer I seek your guidance.

It’s easier for me when I start a story. The key is to connect the future that you want with the present that you’ve already got. The more you understand your character and the situation they’re in, the easier it gets to do so, because you already know how they’ll react. That’s why, for me and this story at least, the hardest part is finding time to sit down and type it up, because the characters are writing it themselves to an extent.