I became uncollected with a roster like yours. Great job. I'd say rank that Doom and Apoc and Ultron. Great for act 6 and villain variants. I used my r5 Ultron (duped though) for 7.4 Superior Kang boss when you get there.
You've got a lot of good champs but not many of them are ranked up. I'd go back and 100% Act 5 to get you an R5 5*. Keep chugging away at monthly EQ. At this point, you need a lot of T1a, T4b and T4cc.
immortality/survivability is going to be important for 6.2 with nodes like icarus,destructive feedback, and prettey much for all chapter except first which is lifecycle. so i would suggest CG
U have decent Tech options I suggest u do the Tech Variant first Rank up even a 4* Sentinel if u have one Ultron & Nebula will also be of great help After that u can proceed with Variant 4 as u can do most of it with lower star champions as well....however the first chapter is a bit harder but I think Kitty Pride can help u with that specially If duped After that u can focus on other Variants depending on where ur roster stands Don't think about Variants 1 & 2 before doing others bcoz the rewards are very outdated
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I suggest u do the Tech Variant first
Rank up even a 4* Sentinel if u have one
Ultron & Nebula will also be of great help
After that u can proceed with Variant 4 as u can do most of it with lower star champions as well....however the first chapter is a bit harder but I think Kitty Pride can help u with that specially If duped
After that u can focus on other Variants depending on where ur roster stands
Don't think about Variants 1 & 2 before doing others bcoz the rewards are very outdated