1. Make a combat system where human skills matter a lot more than character stats. So the one who made over 500 actual PVP fights(at least duels with friends) would be able to kill 2-3 people who have made 50 PVPs given equal characters.
I love your idea man. I am also pertty sure devs love it too. But it sounds like if i will create a thread in C&I called "Make the game better!" without any solution.
Humans skills in computer games is not like in real life, where you should train for the whole life (but it mostly because of physical state if we speak about real fights). In a computer game you have limited amount of rules, as soon as you understand all combinations of this rules you are done. The complexity of the combat system only determines how many time do you need to spend to become "master". Since this is MMORPG you should always remember that this knowledge is not personal, you can share it (like it was with "best deck for hafen combat", or like it is in any other MMORPG game, for example proper skill build/rotation for any class in WoW). There are some solutions to make the combat unique for each character, for example randomly-generated skills based on some archetype for every character, but this kind of combat system is hard to create with proper balance, and they also have some downsides.
2. Make combat system where combat assistance bots are less of value (this is really hard - banning for bots is waay easier)
This is pointless if the (1) is achieved. You will need AI to get the real value from the bots in this case.
3. Make leveling benefits so unlimited stat and quality character (stat 20000 and q300) has 50% chance to win against 2 players of same skill with stat 100 and q 40 and 10% chance to win against 3 such players. So there is a reason to grind. But reason to get more allies is waaaay bigger.
I'm not sure what are those % means. You want a random-based combat, or skill-based?
4- the simplest one. Make the growing stat cap at least. Add +10-+30 to all caps each week. This way people would have to do PVE all the time but botters would not get huge advantage.
This is mostly equal to the non-stat-cap