Minecraft Steve is good for DPS, but he's so squishy that he rarely has time to get a hit in :/ he also has trouble with debuff resitance so he's extremely vulnerable to Jesus's or Emilia airheart's stun
I recommend replacing him with an ambush, like will wood, his rat summon deals decent dps + his squishyness is countered by both his insane dmg resistance and his ability to dodge when he uses his attack. Usually he lasts a while on my team, but I'm not sure
You could also substitute a defense like Macho man. He's super tanky and really hard to kill, granted he does little to no dmg, but he also has supporting abilities, like giving the team a slight buff from his "pep talk" ability after he reaches half health
Also I recommend you to upgrade Jesus, he's extremely meta currently and will probably be the most meta healer for tye time being :3