(....)
->Writing and keeping it with you/your place: What if someone got the access in your absence of theft or any disaster?
-> Obviously keep it online in email of any other way is risking your funds.
About this, I am trying to avoid storing any of my mnemonic phrases online, all are only offline.
Another thing is store it also in multiple places, and the one down side of this is the risk will be higher if you store it on multiple places but at the same time you have more back up, just make it safe to be able not be access by other people.