There is so much to do it's tempting to try to do multiple things at once. Listening to music while reading or doing chores, reading the news while watching movies or shows and so on.
Why can't we focus on one thing at the time anymore? Why it feels we don't have time for everything and therefore need to do more than one thing at the time.
And while we do those things, we don't concentrate on any of them. They just slip through and afterwards we have this false sense of accomplishment without a memory of what we just went through.
So if we don't remember any of the things we do at the same time, maybe bone of them is worth doing in the first place. Or maybe we could drop all but one and focus on that instead. Maybe with a memory of it still there after we finish. And for those other things, just consider them done as well. You remember as much of them as if you would have followed through them while doing that one thing anyway. Now, you at least have something you can remember. And it's kind of an achievement to decide not doing something.