I have recently started trying to simplify how I track things in my life, from habits to todos. I used to have each thing in its own little app and that ended up just frazzling me. I also did not want a "do it all" app because I wanted something simple, quick, and private.
I have been using Obsidian for a while for just taking notes, but after finding the Dataview plugin I have started just using it for all of my tracking, except for a calendar app.
I find it much easier to just write everything in my daily notes, including todo items, and have incomplete ones appear on a dashboard so they are not forgotten. I still need to find a way to have periodic reminders of certain things, hence the use of a calendar app still.