One thing they could do is just put mounts on the currency grind. Say 20k wolf marks, or higher amounts if they raised the mark cap to say 50k.

And then the ultra grind wins reward could just be a recolor of the same mount design. Bolder colors mount for spending weeks/months grinding out wins.

Ideally you'd have a complete revamp of the reward structure for the whole game. A new objectives window which shows all the prizes you've yet to obtain and multiple goals / methods to earn progress towards each.
Some goals might be deal X amount of damage in a single match, earn X amount of KOs without dying, capture X amount of ovoos in a single match, etc.