Are you sure that is why they deactivated your account? I go a long time in between sales and I haven't been deactivated. I didn't make any sales there in April or May. Wouldn't they want to let your account stand so you could purchase? Maybe you weren't responding to messages.yikes! I dont sell a lot on Mercari, I'm usually a buyer but I sold a some heels and then they deactivated my accout for not making anymore sales...lol
I've heard people say that Mercari limits them to 100 items but I have more than that.