I'm in the same boat! I have enough SCs but not enough sectors to maintain platinum (my QA flights weren't eligible, as I booked directly with QA). I have a flight booked for today and a few flights in early March, which will get me the sectors. But it's not good enough. VA customer service said that today's flight will count towards maintaining platinum but that I will still be short on sectors, so they will drop me to gold and won't extend my platinum status.
I tried to put my membership on parental pause at the end of 2021 (I had a baby), but VA customer service said there was no need to, as a 28 Feb 2023 renewal date was generous enough. In hindsight, I should have pushed for parental pause. But it's hard being on hold with a whinging baby
It doesn't matter anyway. I haven't been able to fly ahead for the last 5 flights and I can't get a seat in most lounges during peak periods. So gold won't be that bad.