Please me on starting act 4

So Hi everyone who reads this message,
I recently finished act3 but now I can’t move on to act 4 because of my characters.
I have a 4 star Ironman infinity war, 3 star havoc, 4 star omega red, 4 star crossbones, and a 4 star hood. However I don’t have any tier 3 catalysts to rank them up, so they all are at 1000-1800 range, but recommended is like 13000 and mine is 6000. What do I do? My name is CoolRampage. Thanks
I recently finished act3 but now I can’t move on to act 4 because of my characters.
I have a 4 star Ironman infinity war, 3 star havoc, 4 star omega red, 4 star crossbones, and a 4 star hood. However I don’t have any tier 3 catalysts to rank them up, so they all are at 1000-1800 range, but recommended is like 13000 and mine is 6000. What do I do? My name is CoolRampage. Thanks
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When you can't keep going in Act four 100 %act three