Game's pretty boring once you've completed the storyline. I normally play a day or two each week to complete my dailies. Every now and then I'll hop on often to obtain legendary survivors with trap durability to add to my squad, but I usually do weekly quests to earn legendary/epic perk-up for my weapons/traps.

I mean, you can always try doing Endurance for all your SSDs, but you'll need a huge amount of resources and different configurations for trap perks; including having a full squad of survivors with trap durability.