In the last days I spent a disproportionate amount deleting old accounts I found in my password manager, and mostly because so many companies - despite the GDPR - have rudimentary, manually when not completely nonexistent processes to delete your data.
In this post I describe my process going through about 100 old accounts and trying to delete them all, including a top 10 for the weirdest, funniest or most interesting cases I encountered while doing so.
Congratulations on completing this!
I have indeed moved most accounts to individual aliases. I used to use the same username and similar emails (perhaps grouped like shops@mydomain), but I got no benefit and the username allowed unnecessary correlations.
So alias + random username and I will have much much less trouble in the future. Hopefully!