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Just buy a cheap game for 50 cent then wait 30 days and you have market access again for a year.
Just remember for the future to again buy a game before the 1 year is over or you will get the 30 day cooldown again.
This applies to every single steam user.
You can see your purchases here: https://store.steampowered.com/account/history/
Cheapest games on the Steam Store: http://store.steampowered.com/search/?sort_by=Price&sort_order=ASC&price=0%2C5
Dec31, 2015 is older than 1 year.
Both of your purchases fall outside of the requirements.
Have you done any refunds? If you refunded a recent purchase, it could mean you no longer have a purchase that meets the requirements. As Forcen mentioned above, you can see your entire purchase history here:
https://store.steampowered.com/account/history/
And more information on the market restriction here:
https://help.steampowered.com/en/wizard/HelpWhyCantITrade