It gets over saturated after a while of just simulating fights and your fighters just dominates everyone I would suggest to have different difficulty levels Example: Very easy, Easy ,Normal, Hard, Very hard.
And also making the fighter more interactive with habits
to make the fighters seem intriguing and not just standard boxes of stats makes it less engaging. And having the ability that’s affect stats such as having the ability subtract or add to the fighters stats just adds more depth to the game such as hard worker, high work ethic, low work ethic, power puncher, excellent cardio, cocky , stoical , humble , tough and etc. For example:Hard worker +5 aggression.
And just having overview of the fighters can you add a view of the fighters face so we can have a visual of how our fighters look and make it randomly generated faces because just looking at his stats and not being able to see my fighters just makes me less engaged in this game.
And having backgrounds for fighters that also add abilities or add or subtract from stats. Background such as loner, refugee, spoiled child, wild child, ex-con, ex-soldier, and etc. I can’t think of anymore but you understand.