It's a shame the graph only goes back so far. As with many nebulous statistics, you can draw more or less whatever picture you'd like. Something like a 12-18 months ago, we experienced a sudden spike from the 200k+ range to 80-90k. What you're seeing is not a downward trend, but the end of a boom that honestly shouldn't have happened in the first place. Some of my tweets garnered a little bit more attention than they should have, which generated a bunch of media buzz.
Here's a longer-term trend on Google Analytics, data only for the FE wiki (our most-visited service by far), with monthly granularity.
Of course, I do acknowledge that we're not currently on the front page of Reddit as we were on the 16th of March 2018 (that day alone is responsible that March spike), but even then I think it's fair to say that the past 2 years have been good for us
I have access to a good amount of stats - if there's something specific you'd like to know, I'd be happy to look it up.
Our social media accounts have been growing steadily and stably, with much more success on Twitter than Facebook:
https://socialblade.com/twitter/user/flatearthorg/monthlyhttps://socialblade.com/facebook/page/flatsocThat's my own fault. I find Twitter much more intuitive from a creator's perspective.
On a separate note, I (and I suspect others) have no intention of trying to monopolise the FE movement. I'm happy to make a contribution, regardless of how large it is at any given point in time. If the FE movement is growing (and I think that's currently indisputable), then we're doing something right as a community.