Well, it's a tiny sample size and it may be 100% variance, but, by following the basic PS strategy for Fixed Limit Fullring, I was able to be profitable in my 9.5k hands of 0.02/0.04, played during the first 2 months of 2018.
My stats at that time:
VPIP: 11.79; PFR: 7.51; AF: 2.65; WTSD: 30.78; WSD: 62.12.
But, after those hands, I had to decide between trying to learn FL SH and spending a lot of time looking for playable/fishy tables or finally trying to learn NL FR and see where that leads me.
So far, I've played 31k hands of 0.01/0.02 NL FR. I still have a lot to learn, but I believe I'm an ok player at this first limit.