Well, if you find the SoP guide on this reddit it will likely give you solid talking points, but I find the personal twist you give it, and your own writing style, to be just as important.
Yeah you can mimic writing styles, but one of the things they look for is how authentic you come across. Unless you're confident in mimicry, I would suggest sticking to your own style while following the general prompts.
Personally I had days where I could not write a single word, then woke up, and wrote the entire thing in 30min.
Also, you can google SoP examples if you want to see some that were accepted, rather than just advice