I finished "Hardspace: Shipbreaker". It was pretty fun! Much better story than most sim games.
I'm mow playing "Enderal", a totally free full conversion of Skyrim. You need Skyrim, obviously, but everything is new. New world, story, questlines, skill trees, everything. So far it's really, really good. Much better than Skyrim. It's difficult, but there is no level scaling so you can actually revisit areas when you levelled up.
I found a slightly different system online once. You mark your todo list with a dash (-) in front. If it's done, cross it to make a plus sign (+). If it's something that you postponed or moved to another list/page, turn the dash into an arrow (->). I adapted it from the dash-plus system years ago: https://www.patrickrhone.net/the-dash-plus-system/