To produce a mighty book, you must choose a mighty theme. No great and enduring volume can ever be written on the flea, though many there be that have tried it. ↗
And were an epitaph to be my story I'd have a short one ready for my own. I would have written of me on my stone: I had a lover's quarrel with the world. ↗
Write your story as it needs to be written. Write it honestly, and tell it as best you can. I'm not sure that there are any other rules. Not ones that matter. ↗