Chickadee, for me it all depends on how much exercise I'm getting. If I'm going to the gym at least half the days, I can get away with 30 and stay in moderate ketosis. If I'm not getting that much exercise, I have to stay at 20. If you up your carbs and don't lose, drop them again. If you find your cravings come back and/or you can't stay OP, you may have added something that's a trigger food for you. I find for me, it's best if I experiment cautiously with ONE new food at a time. Not a food group, like fruit, but just one food, like strawberries. That way I find out if it's OK, or it makes me want more carbs, and I don't have to spend a lot of tiime figuring out which one(s) of 4 or 5 foods it might be. Good luck, and remember this is all about learning what works for each of us and what doesn't by experimenting with it, it's not about diet dogma.
"Time and trouble will tame an advanced young woman, but an advanced old woman is uncontrollable by any earthly force." --Dorothy L. Sayers