You can always set up challenges within your alliance… I’ve done a raid bingo… finding either specific alliances (sorry, @KLinMayhem) or specific tanks. I’ve also done other raid challenges… like use only healers or must use weak color mono team… just have to get a little creative.
I farm with new heroes so I can play with their specials and find new synergies.
And of course war is always fun to bring the alliance together. We assign avatars for phrases that are mentioned during war chat… like if someone apologizes, they have to be friar tuck for a day.
It might be time to go on a walkabout. Not to ditch your alliance per se… just to see how other alliances are keeping things light and fun.
Good luck and happy grinding!