What would you add to Heroes? (creative ideas only!)

No one is looking for an easy path, but even so, having only 8 heroes for each faction feels insufficient, and they are almost all the same: most of them increase the attack and defense of a specific type of monster by 1 every 2 levels, starting from level 1. And that's it. There are also a couple of heroes that work with certain skills. Is there room for improvement? I don't think so. There aren't any distinct personalities, and the entire gameplay often boils down to this formula: level up, gather as many suitable monsters as possible, and go on the attack. And there are almost no heroes like in the old days (in Heroes 3). It's also not interesting to play for a long time with just one faction. I'm not arguing that I'm somewhat of a "min-maxer," but one of my favorite things to do when playing Heroes 3 was to see: how much damage would Meteor Shower do at level 16 for a hero with the corresponding specialization, compared to a hero with a different specialization and the same level and magic power.