Well, as I have explained in Discord and briefly mentioned already here also, the top miner (~130PH) left due to luck.

His plans for Bitcoin this year of being 350PH by the end of the year never happened.
We've had a pretty stagnant year with the hash rate, although we've had a few large miners join, they seem to not stay around long term.

I guess since the hash rate drop from the large guy leaving, and others who want less variance, some others have left also.

I also mentioned earlier about how I've been in discussion with a few 200PH miners on various occasions this year, but they were, to be blunt, a waste of time and I doubt would ever have come here anyway.

I guess people prefer higher fees, fake information, and less reliable service.
None of which I've done here

The "100 Luck%" shows luck drifting around, between 93% and 107%, (on 100 blocks) so that's actually all quite as expected.
Alas, pool size decides how long the good and bad luck lasts, and even at 200PH, some miners still don't get it