I have several versions of my bio, each built from the other. I use the smallest bio acceptable for where it will appear. A back cover blurb is two sentences. An inside back cover flap or an inside back page bio will be longer,, with more info about my history and my other writing, as well as the links to my website and to my social media accounts There's no reason to go to great lengths with a bio as far as I'm concerned. People who want to learn more can go to my website, or follow me on social media.
Note that you can also have an Authors Note, or Afterward (or whatever you wish to call it) and write as much as you want about you and why you wrote the book.
Back cover bio for my latest book,
Dark Green:
Lif Strand lives off the grid in a straw bale house way outback in New Mexico. When she's not writing, she's taking photos, hiking, playing with fabric art, or caring for her retired Arabian horses.
My book takes place in the way outback of New Mexico, and although my main character doesn't live off the grid in a straw bale house, the first sentence takes care of showing I know my book's setting. The rest gives an idea of who I am (not a highly social person but an active person) and maybe will get some readers curious enough to look at my photos.