The best solution for an interesting gameplay on x1 may be -
Mode, Seasons,;
Seasonal rewards (caps, consumables or custom consumables, cards and more);
"for example - those consumables can only be obtained in the season mode"
it can be custom food for GvG, Buffs for farming, potions, universal taming item hmmm…
A progressive gear for season characters;
New Currency and Vendor for them;
Seasonal quests
and etc =)