I used to have a STW subscription, I didn’t renew, though I still buy it quite often.
I did however get bought an MBR subscription for Christmas (the thought was there), the first two have arrived, I’ve looked at them ominously and thought “there’s my evenings this week gone/this is gonna take some getting through”.
Same as OP, 30 minutes later I’ve read everything of any interest/quality and want something else. Same goes for the WMB I had on valentine’s day.
I like STW world, but for me a lot of it is taken up with the epic foreign trip stuff, which is all very nice, but a bit out of reach for a lot of people, me included, and thus doesn’t hold my attention, even as an aspirational thing.