It seems the fediverse is continuing and growing again. Line go up is probably good!
https://fediverse.observer/stats&months=50
Total users are huge now.
There are many websites out there that pull data from the fediverse. So take that with a grain of salt. But anecdotally I am seeing a small rise in people using the various platforms as each get more mature and servers somewhat stabilize.
Fwiw, a number of highly popular 3rd-party apps including Voyager now offer support for PieFed. Most do not provide the full range of features as compared to the web interface, though some like Interstellar provide the large majority of them - see fully detailed listing of each app and which features are supported at https://piefed.social/community/fediverse/wiki/piefed-app.
Anyway, I confirm first-hand that using Voyager to access a PieFed instance is nearly identical to accessing a Lemmy one, except for the gain in back-end functionality of PieFed doing what Lemmy cannot (e.g. you apply some settings rarely in the web UI - maybe a couple times a year - and then those continue to function as you switch to more daily usage in your app of choice).
So use whatever you like - sh.itjust.works seems to me to be a fine instance - but I'm just saying that for a new person joining the Threadiverse, the web browser UI of PieFed is not the only or even the main way that people can choose to access it.