I haven't had babies from mine now in well over a year. Think like late 2019, early 2020? Was the last batch of baby platies I had.My water now is soft too. My anti-livebearer thing started when we had hard water, they were a bit too happy...
Problems with them in soft water is theyre more prone to problems. My mollies particularly do end up fighting fungal infections quite often. Treat it, goes away, comes back a couple weeks later. It's a cycle and it's not fair to the fish. I won't want to keep more with my water as soft as it is.
If I had harder water, I'd be over the moon to keep a nice colony of something like goodeids or fancy wild endlers or swordtails.
Only livebearer I can really do is least killifish (not actually a killie). I'm juuust in the GH range for them at 125ppm