Introduce a "numeric testament" (timed self-destruct account)
What happens to an account when someone dies or abandon it?? Nothing... All datas are still socked on servers.
It takes a lot of energy to keep datas and accounts alive, uses lots of storage and generates useless carbon print.
Moreover, this feature should ensure a higher step on keeping privacy safe, even after user's death or account abandoning...
For that purpose, you should introduce by default a self-destruct account option, that an user could be able to parameter (total wiping after one year of inactivity, two years, etc...), whatever, a deadline by default in case of total long term inactivity (by example 5 years).
Thanks for your attention.