I’m assuming you have some un-/partially leveled 4* heroes you didn’t post? You are light on healers—Rigard and Boldtusk are great, but in Alliance wars you one (or two!) per team, and even on titans it’s nice to bring a healer of the strong color.
Isarnia is worthy of scopes, once you get three more. I would hold off on leveling Khagan or any of your green 5*s, though. With Lianna and Kadilen you’re in a good position there. Azlar would like company, but I just don’t find Khagan to be impactful. Zimkitha, Mitsuko or Santa Claus would be very nice if you happen to get any or all of those.
There’s a good purple attacker coming soon in Season 2, and January’s HotM is a very solid purple healer. I would vote for either of those above Quintus for your near-complete tabard set.