I play with a friend or two sometimes but I mainly solo... I've upgraded the Bunker to lvl 3 as of last night. Bounties, bounties, bounties, weeklies, and weeklies along with Seraph Towers, lots of them. When it comes to the Seraph Towers just start one and hope people join. Or travel, relaunch and hope you find one that is going on with a few people. I've noticed that often people just don't want to start them so if there are a few people in Winding Cove just start it up and they'll usually jump in and others will load in to join... I will say this season does suck but there's still plenty you can do and get done as a solo player. 2 cents.