Making a concerted effort to close notes in my area.
Unfortunately the OSM website has a limit to how many it can show you at once and it shows the most recently updated ones, so you can't see how many unclosed notes still exist.
One of them is over five years old and requires on-site verification, so I know what I'm doing this weekend!
The built-in tools on the main osm website are really limited. My favorite 3rd party tools for managing notes:
Notes Review: this is the best tool. You can filter notes by anything, date, location, user, etc. Also embeds linked images from notes, so you don't have to open them separately.
Resultmaps notes: Lot of data, click on your country to filter more.
Notes heatmap: this is very useful to see your progress, but at first glance it looks like a population map, relevant xkcd
noteSolver: JOSM plugin, select the notes you work on, it will automatically solve them and comments a link to your changeset
I wish Notes Review let you filter out a user. One person makes a lot of notes in my area, and many of them are ones that are low-priority to add. It would be nice to be able to see everything else. I know I can do this on StreetComplete, but it would be helpful to be able to do it on desktop as well.
Oh yes, osm usernames are strange: they can also contain any unicode characters, spaces, emojis, and you can change them anytime. I don't know any other site where username requirements are these lax.
There were already minor abuses, a troll registered as the username of a DWG member, but replaced one letter with a homoglyph. E.g. these are different unicode letters: oоο Just copy them to a unicode decoder.