Welcome to Postcrossing.
I was in the same boat a year ago. Organize. Twiddle thumbs. Wait.
Then, a Postcrosser recommended I check out the Forum. Good suggestion!
I have thorough enjoyed such fora as Many Themes, Write Back my Postcard, various lotteries, NA exchanges such as NA traveling envelopes, Monthly Round Robin/Canadian Edition, All About Women and so much more!
Have a look! I am certain you’ll find something of interest while you wait for official cards. Which will be a while …
Have fun … ! 
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