You currently are at Gear Score 327, which means that you did not yet finish the campaign in DC.
In order to be able to play the Seasons, you need to finish the storyline in DC first (which means playing all the main missions, reaching level 30 and then playing through the World Tiers 1 to 5) and then also the storyline of WoNY (raising your character's level from 30 to 40).
Because only with a level 40 character and with having the story of TD2 (main game) and WoNY finished, Seasons will be unlocked. Not only because they are a dedicated endgame activity, but they also continue the story after the events of WoNY lorewise.
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