I would like to some of the weapons and armor lines be continued. Such as the Troika line. I would love to have a choice for 5* sword. Possibly have elemental heavy swords, like the Glacious and such. Swiftstrike would also be a good suggestion to work on. Maybe even introduce a hammer line and continue on from the Thwack Hammer.
To add some new dynamics, maybe introduce a new star tier and take it up to 6? Many of the weapons and armor have much potential and aren't worth much to players without lack of upgrading. Allowing more options would increase the play time of the game.