That was brutal haha. Yeah, I don't know what was happening there. GGs though.
Against Big Band I think you just need to keep the pressure on, the key to mounting an offensive against the character is just making the best use of multihitting normals to break the armor. The multihitting moves are also much more difficult to parry as well. After that his reversal options aren't all that stellar and he becomes super vulnerable to the instant overhead shenanigans that everyone can lay down on him.
I just felt like you tried to play the matchup a lot more carefully this time around and you'd often put yourself out there at mid/far screen which ends up being the ranges that I'm most comfortable in, I can react to jump ins and can use AA grab to stop your approach. Get in my face so that I can't use AA normals comfortable and have to rely on unsafe things to push you back out.
Noticed you were going for a lot of frame traps with Filia with ending block strings with DP which, while an option you definitely want to make sure you keep in your backpocket, didn't seem to work out for you in most instances. If you want to keep using DP then consider combining the motion with your assist button in order to get both your DP and an assist that keeps that DP safe. DP Motion LP+MK would do the trick and potentially allow you to continue pressure afterwards because LP Up-Do doesn't have all that much recovery. If that doesn't do the trick consider switching to Drag N Bite assist instead.
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Against Peacock hell if I know, the buff to HK Plane Bomb is sort of amazing and lets her create a wall of projectiles much more effectively than she could before and your team isn't really equipped to deal with it. If you had Big Band rush punch assist that would pretty much destroy the zoning game though because the thing hits full screen and has armor so, at the very least, it'd clear the projectiles on the field. Cerebella Lock N Load would also do the trick in clearing out forward projectiles and allowing you to move forward, both are seriously good anti-Pea/Double assists.
More than anything though I'd recommend doing more to diversify your mixup/reset game as there didn't seem to be much there outside of burst baits and airdash pressure. Your Squigly strings ending in the LK Divekick into low also didn't seem to pan out as much this time around either.