Stuck and need help

asked my brother and all he said is get good, but i have 100% all acts till 5, 100% event quest done as well and now there's nothing actually to do. back issues is wayy to specific and difficult. what should i do, i am currently stuck on 6.2.4 and its just too hard because of the accidental damage i have tried so many times that deadpool x force never dies i do like 100 damage to him with my 15-18k rating champions. r3 6 stars and that too good tier ones still hard. i know skill issue but there should be a other things i can do to progress? to upgrade champs you need money and you hardly get any gold to rank up a 6 star now or even complete the super daily without upgrading random low champs to just get the rewards. anything i can do to improve and stuff? i really like this game and dont want to quit directly i even got the sigil subscription just to get stuck and waste my days. i also have the suicide masteries, 3/3 willpower 3/3 that poison one and 30% atk and 2/3 bleed one, if thats necessary to know.
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Assuming you have completed Road-2-Lab to begin with ? (doesn’t that give out Units initially ?) But is quick and easy, single-energy per fight, just start it on Auto-Fight). To finish up Daily Super every day.
Or if you have more energy to use, auto-run the Classic versions of Back Issues (Units there too).
Or else Arena fights as well, rack up some Units milestones along the way.
Edit: i just checked there are units. Any other suggestions you have?
Hulking is nice, Serpent too, or power control champions such as Doom or Magik.