As another admin of a much smaller instance, I also feel grateful to all the mentioned groups, and especially the admins of the larger instances, whose experience I can often piggy-back on and without which, running a smaller instance as a single admin would be much more difficult :)
I'd also like to remind everyone that Lemmy does not equal the Fediverse, which is a misconception I feel like I see constantly here. When you say "I am on Lemmy" or things along those lines, you are conflating the Fediverse with the software you are using to access the Fediverse. This is kind of like saying that you are on Firefox instead of on the internet. Firefox is just your browser that you use to access the internet.
Likewise, Lemmy is just your "Fediverse browser" and there are other alternatives. And just like we shouldn't judge people whether they use lemmy.world or lemm.ee or whatever other instance, we shouldn't judge people on whether they use Lemmy or Kbin or Mastodon. Different people like different things and having a choice about what software to use is the greatest feature of the Fediverse. You have a choice of software, of instance, of admins and even of mods.
I see a lot of people saying things would be better if we just change Lemmy to something else (like Sublinks, or any of the other alternatives). But remember that it's still just the Fediverse you are connecting to. You are not on Lemmy, you are on the Fediverse. And we're all on it together (well more or less, barring defederation...).