Well Thomek you seem to ignore the fact that you nerf yourself. Anyway, if you really wanted to make infantry stronger, you need to implement some changes. But not to ranged or cav. To infantry: Split WPF is bullshit atm, your damage and speed is insanely better when you take all WPF in a single weapon type. But Hoplite is not very fun for many ppl, and hoplite is ideal infantry: rapes horses and has a shield. Give more infantry access to polearms and shields and they would crush ranged and cav.
But mostly change people's BRAINS. Currently teamwork consists of gank. That's it. It's a ME, IM THE IMPORTANT THING mentality that you have to remove. So, remove the scoreboard, in it's entirety. Just have a list of players. Remove the need for ppl to stack their KDR, and they will give more to team effort. Or have some proper assist system, so you can be proud that all you did was act as a running arrowscreen for your 2hander to get amonsgt the ranged and rape them, or you stood and blocked 2 guys for 2 minutes while your team arrived. But those things cannot be implemented, and the balance is half the issue: Either have ROCKSOLID bannerbalance or NONE, or I don't know, but currently 1: teamhitting/killing is not punished NEARLY enough, not even close. And team spirit is non existant. When you see a teammate getting overwhelmed, currently it pays off to just think "Oh well, fuck him" and run off. And saves dont pay off either: teammate horse slain, he falls at enemies feet, I often (and I see others too) leap over his body and shield him if I have one, or try and block the incoming hits: that should be rewarded too.
So much could be taken from Battlefield aswell: When I see a ninja about to overhead sleepy archer and I throw an axe 20 metres and headshot that ninja, I should get a fucking reward.
Also awareness: Cav or ninjas or something coming behind my teammate, I wheel about and prepare to receive them, teammate just stares at me like "Why you pointing a sword at me bro?" instead of making the fucking logical thought train: Oh, this guy is pointing at something behind me. Just last night I saved a guy just like this, stab past his head and kill 1h-cav horse just before he gets teammate: teammate starts attacking me with sword cause he thinks I tried to stab him and missed, fucking clueless that enemy is rolling on ground behind him.
You cannot make people more aware, you cannot stop newer player from stacking strength and making themselves arrow and lance magnets, and you cannot realistically make most infantry take shields and poles to make them a stronger unit but weaker individuals: ppl dont want that. I mean, it works well to have entire fighting group be shielders with poles and 1handers, on balanced builds, maybe 18/21. Your team will win very often, but since its hard work to make ppl get rid of their super op 2h hero or polespammer extreme, it aint gonna happen.