I think most of the people I'm currently following are still out there, they just aren't posting as much (I see them commenting here and there). The rest of you all are a part of the league, so I am trying to comment on as many of everyone's posts as I can. As you say, though, time does eventually run out, and I don't always come up with something to say.
I go to the introduceyourself tag and that's exactly what I find, too. Plus a lot of languages that I don't understand. So, not going to be very meaningful if I go and say, "Welcome to Steemit! Have fun!" to everyone if I don't have a clue as to what they're saying. Hopefully someone who does is doing that anyway.
I find it tough to really use any of the general tags, because they get used for a lot more than just the topic, and since there's five different tags people can choose from, that muddies things up some more.
I need to do a better job of getting into the tags that are specifically for a challenge or something, like dragosroua's challenge30days tag. I've had some success with the nobidbot tag, but there's only about a dozen people who use it on a regular basis and not all of those posts are things I share interest with.
That's the biggest issue, aside from finding good posts, is whether or not I have anything to say when I'm done reading the post. :)