Recently, buying a gun is more often because of an actual concern for safety. Women are about as likely as men to feel concern about that. Hence, the numbers are now more equal.
If this is the actual underlying reason, then these new gun buyers will be less likely to buy a second, third, fourth, etc. gun. Like someone who just buys a car to get around, and thus is less likely to have an urge to get a new one every year, the new gun buyers of 2019-2021 will be more likely to only buy another gun if there is something wrong with the old one.
Again, I gave it about 30 seconds' thought, but that's my guess.