I had a few ideas about this. Namely expanding on an already great mechanic. Perhaps you could add some customization. Maybe options to make a weapon two handed (or one handed in some cases)
Furthermore maybe having an option for a shield, or even select pieces of armor. I know rings are in short supply for the most part, maybe having an option for something that is better than the readily available stuff, but not as good as the end game gearx similar to the function of pit weapons