One of the good habits Obsidian has slowly and finally led me into is making my notes ever so slightly more atomic.
(Why finally? Because I have been thinking I could benefit from doing this since basically forever.)
Which is a very roundabout way of saying that I am becoming better at creating and using topic-specific notes, rather than throwing exactly everything into the usual jumble of date-specific notes.
Before Obsidian, I only really used one or two topic notes, and they themselves also grew quite large and unwieldy. Thinking about why I am getting better at it now, it all seems to be down to Obsidian making multiple files easier to work with (and me actually learning the right way of doing it, of course). It is as easy to create a new note as it is to open an existing one - always just command+O - and after internalizing that all I needed to do was start naming my notes properly. That is, by the very first, brief, thing which pops into my mind, the thing I will hopefully try writing the next time I want to open the note. "Stuff to discuss with Person Personsson" sounds nice and clear, but if my mind always snaps to Person's user name perper, then that is what the note should be named.
Think of something to ask Person about the next time we meet? I hit command+O, type "per", hit enter and start typing.
And then, just as crucially, when I wonder about my notes for Person, I just hit command+O, type "per", hit enter and read.